diff --git a/gitnexus-shared/src/scope-resolution/types.ts b/gitnexus-shared/src/scope-resolution/types.ts
index 1cff701156..c3d8b80fbc 100644
--- a/gitnexus-shared/src/scope-resolution/types.ts
+++ b/gitnexus-shared/src/scope-resolution/types.ts
@@ -10,8 +10,16 @@
  * Lifecycle contract (RFC §2.8): scopes are **constructed during extraction,
  * linked during finalize, immutable after finalize**. All fields are
  * `readonly` at the type level; `Object.freeze` is applied at runtime in dev
- * builds. `ReferenceIndex` is the sole structure populated after freeze — by
- * resolution, before emission.
+ * builds.
+ *
+ * Two structures are populated after freeze:
+ *   1. `ReferenceIndex` — by resolution, before emission.
+ *   2. `ScopeResolutionIndexes.bindingAugmentations` — the dedicated
+ *      append-only post-finalize binding channel (e.g. C# same-namespace
+ *      cross-file fanout). The companion `indexes.bindings` is the
+ *      finalize-output channel and is deep-frozen by `materializeBindings`;
+ *      walkers consult both via `lookupBindingsAt`. See `ScopeResolver`
+ *      Invariant I8 for the full lifecycle contract.
  */
 
 import type { NodeLabel } from '../graph/types.js';
diff --git a/gitnexus/src/core/ingestion/call-processor.ts b/gitnexus/src/core/ingestion/call-processor.ts
index 2debe56b31..4eb7ea6ceb 100644
--- a/gitnexus/src/core/ingestion/call-processor.ts
+++ b/gitnexus/src/core/ingestion/call-processor.ts
@@ -770,7 +770,7 @@ export const processCalls = async (
     if (!tree) {
       try {
         tree = parser.parse(file.content, undefined, {
-          bufferSize: getTreeSitterBufferSize(file.content.length),
+          bufferSize: getTreeSitterBufferSize(file.content),
         });
       } catch (parseError) {
         continue;
@@ -3257,7 +3257,7 @@ export const extractFetchCallsFromFiles = async (
     if (!tree) {
       try {
         tree = parser.parse(file.content, undefined, {
-          bufferSize: getTreeSitterBufferSize(file.content.length),
+          bufferSize: getTreeSitterBufferSize(file.content),
         });
       } catch {
         continue;
diff --git a/gitnexus/src/core/ingestion/constants.ts b/gitnexus/src/core/ingestion/constants.ts
index 81f1107e14..4862d31a0f 100644
--- a/gitnexus/src/core/ingestion/constants.ts
+++ b/gitnexus/src/core/ingestion/constants.ts
@@ -1,3 +1,5 @@
+import { Buffer } from 'node:buffer';
+
 /**
  * Default minimum buffer size for tree-sitter parsing (512 KB).
  * tree-sitter requires bufferSize >= file size in bytes.
@@ -12,8 +14,13 @@ export const TREE_SITTER_MAX_BUFFER = 32 * 1024 * 1024;
 
 /**
  * Compute adaptive buffer size for tree-sitter parsing.
- * Uses 2× file size, clamped between 512 KB and 32 MB.
- * Previous 256 KB fixed limit silently skipped files > ~200 KB (e.g., imgui.h at 411 KB).
+ * Uses 2x UTF-8 byte size, clamped between 512 KB and 32 MB.
+ * Keeps tree-sitter's byte-sized buffer above large ASCII and multibyte sources.
  */
-export const getTreeSitterBufferSize = (contentLength: number): number =>
-  Math.min(Math.max(contentLength * 2, TREE_SITTER_BUFFER_SIZE), TREE_SITTER_MAX_BUFFER);
+export const getTreeSitterContentByteLength = (sourceText: string): number =>
+  Buffer.byteLength(sourceText, 'utf8');
+
+export const getTreeSitterBufferSize = (sourceText: string): number => {
+  const byteLength = getTreeSitterContentByteLength(sourceText);
+  return Math.min(Math.max(byteLength * 2, TREE_SITTER_BUFFER_SIZE), TREE_SITTER_MAX_BUFFER);
+};
diff --git a/gitnexus/src/core/ingestion/finalize-orchestrator.ts b/gitnexus/src/core/ingestion/finalize-orchestrator.ts
index 8541e58aaf..942faa1c96 100644
--- a/gitnexus/src/core/ingestion/finalize-orchestrator.ts
+++ b/gitnexus/src/core/ingestion/finalize-orchestrator.ts
@@ -141,6 +141,11 @@ export function finalizeScopeModel(
     methodDispatch,
     imports: finalizeOut.imports,
     bindings: finalizeOut.bindings,
+    // Empty post-finalize augmentation channel. Populated (if at all)
+    // by language hooks like `populateCsharpNamespaceSiblings` running
+    // AFTER `finalizeScopeModel` returns, before `resolveReferenceSites`
+    // consumes the bundle. Most languages leave it empty.
+    bindingAugmentations: new Map(),
     referenceSites: Object.freeze([...allReferenceSites]),
     sccs: finalizeOut.sccs,
     stats: finalizeOut.stats,
diff --git a/gitnexus/src/core/ingestion/heritage-processor.ts b/gitnexus/src/core/ingestion/heritage-processor.ts
index 6692d1c950..12e59a19ac 100644
--- a/gitnexus/src/core/ingestion/heritage-processor.ts
+++ b/gitnexus/src/core/ingestion/heritage-processor.ts
@@ -220,7 +220,7 @@ export const processHeritage = async (
       // Use larger bufferSize for files > 32KB
       try {
         tree = parser.parse(file.content, undefined, {
-          bufferSize: getTreeSitterBufferSize(file.content.length),
+          bufferSize: getTreeSitterBufferSize(file.content),
         });
       } catch (parseError) {
         // Skip files that can't be parsed
@@ -414,7 +414,7 @@ export async function extractExtractedHeritageFromFiles(
     if (!tree) {
       try {
         tree = parser.parse(file.content, undefined, {
-          bufferSize: getTreeSitterBufferSize(file.content.length),
+          bufferSize: getTreeSitterBufferSize(file.content),
         });
       } catch {
         continue;
diff --git a/gitnexus/src/core/ingestion/import-processor.ts b/gitnexus/src/core/ingestion/import-processor.ts
index d1b039d932..b669d27445 100644
--- a/gitnexus/src/core/ingestion/import-processor.ts
+++ b/gitnexus/src/core/ingestion/import-processor.ts
@@ -306,7 +306,7 @@ export const processImports = async (
     if (!tree) {
       try {
         tree = parser.parse(file.content, undefined, {
-          bufferSize: getTreeSitterBufferSize(file.content.length),
+          bufferSize: getTreeSitterBufferSize(file.content),
         });
       } catch (parseError) {
         continue;
diff --git a/gitnexus/src/core/ingestion/languages/csharp/captures.ts b/gitnexus/src/core/ingestion/languages/csharp/captures.ts
index dc8356346f..2f913a14e3 100644
--- a/gitnexus/src/core/ingestion/languages/csharp/captures.ts
+++ b/gitnexus/src/core/ingestion/languages/csharp/captures.ts
@@ -23,6 +23,7 @@ import { computeCsharpArityMetadata } from './arity-metadata.js';
 import { synthesizeCsharpReceiverBinding } from './receiver-binding.js';
 import { getCsharpParser, getCsharpScopeQuery } from './query.js';
 import { recordCacheHit, recordCacheMiss } from './cache-stats.js';
+import { getTreeSitterBufferSize } from '../../constants.js';
 
 /** Declaration anchors that carry function-like arity metadata. */
 const FUNCTION_DECL_TAGS = [
@@ -52,7 +53,9 @@ export function emitCsharpScopeCaptures(
   // the LanguageProvider contract layer; cast here at the use site.
   let tree = cachedTree as ReturnType<ReturnType<typeof getCsharpParser>['parse']> | undefined;
   if (tree === undefined) {
-    tree = getCsharpParser().parse(sourceText);
+    tree = getCsharpParser().parse(sourceText, undefined, {
+      bufferSize: getTreeSitterBufferSize(sourceText),
+    });
     recordCacheMiss();
   } else {
     recordCacheHit();
diff --git a/gitnexus/src/core/ingestion/languages/csharp/namespace-siblings.ts b/gitnexus/src/core/ingestion/languages/csharp/namespace-siblings.ts
index 3fdaad41ed..2cd2cf7241 100644
--- a/gitnexus/src/core/ingestion/languages/csharp/namespace-siblings.ts
+++ b/gitnexus/src/core/ingestion/languages/csharp/namespace-siblings.ts
@@ -11,17 +11,18 @@
  * field-chain resolution fails at `findClassBindingInScope('User')`
  * in the Service.cs scope chain.
  *
- * Implementation: after the finalize pass populates `indexes.bindings`
- * (from explicit `using` directives), walk each file's tree-sitter
- * AST for `namespace_declaration` / `file_scoped_namespace_declaration`
- * and `using_directive` nodes. The orchestrator hands us its
- * `treeCache` so files already parsed by `extractParsedFile` are
- * re-used instead of re-parsed — `ParsedFile`'s underlying tree is
- * the single source of truth. Group classes by namespace, and inject
- * cross-file sibling classes into each Namespace scope's finalized
- * bindings with `origin: 'namespace'` — a tier below `local` so a
- * local declaration still shadows a cross-file sibling with the same
- * name.
+ * Implementation: after the finalize pass populates immutable
+ * `indexes.bindings` (from explicit `using` directives), walk each
+ * file's tree-sitter AST for `namespace_declaration` /
+ * `file_scoped_namespace_declaration` and `using_directive` nodes.
+ * The orchestrator hands us its `treeCache` so files already parsed
+ * by `extractParsedFile` are re-used instead of re-parsed —
+ * `ParsedFile`'s underlying tree is the single source of truth.
+ * Group classes by namespace, and append cross-file sibling classes
+ * into each Namespace scope's `bindingAugmentations` bucket with
+ * `origin: 'namespace'`. Finalized bindings remain first in
+ * `lookupBindingsAt`, and local lexical `Scope.bindings` remains the
+ * first-tier shadowing channel.
  *
  * The tree-sitter walk is authoritative: it sees `global using static`,
  * aliased `using static X = Y.Z;`, attributed namespace declarations,
@@ -34,6 +35,7 @@ import type { SyntaxNode } from 'tree-sitter';
 import type { BindingRef, ParsedFile, Scope, ScopeId, SymbolDefinition } from 'gitnexus-shared';
 import type { ScopeResolutionIndexes } from '../../model/scope-resolution-indexes.js';
 import { getCsharpParser } from './query.js';
+import { getTreeSitterBufferSize } from '../../constants.js';
 
 interface CsharpFileStructure {
   /** Declared namespace names in file source order. Empty array means
@@ -52,7 +54,11 @@ interface CsharpFileStructure {
  *  shared across calls. */
 function extractFileStructure(content: string, cachedTree: unknown): CsharpFileStructure {
   type CsharpTree = ReturnType<ReturnType<typeof getCsharpParser>['parse']>;
-  const tree = (cachedTree as CsharpTree | undefined) ?? getCsharpParser().parse(content);
+  const tree =
+    (cachedTree as CsharpTree | undefined) ??
+    getCsharpParser().parse(content, undefined, {
+      bufferSize: getTreeSitterBufferSize(content),
+    });
   const namespaces: string[] = [];
   const usingStaticPaths: string[] = [];
 
@@ -106,8 +112,8 @@ export interface CsharpSiblingInputs {
 }
 
 /**
- * Mutate `indexes.bindings` in-place, adding cross-file sibling class
- * defs to each Namespace scope. Class-like defs (Class / Interface /
+ * Append cross-file sibling class defs to each Namespace scope's
+ * `bindingAugmentations` bucket. Class-like defs (Class / Interface /
  * Struct / Record / Enum) are visible cross-file; method / field
  * members are not.
  */
@@ -198,12 +204,15 @@ export function populateCsharpNamespaceSiblings(
     }
   }
 
-  // Inject cross-file siblings into each namespace scope's finalized
-  // bindings. `indexes.bindings` is typed `ReadonlyMap<ScopeId, ...>`
-  // but is a plain Map at runtime; mutating here is the established
-  // pattern (see `propagateImportedReturnTypes` which does the same
-  // for module-scope typeBindings).
-  const finalized = indexes.bindings as Map<ScopeId, Map<string, BindingRef[]>>;
+  // Inject cross-file siblings into each namespace scope's
+  // post-finalize augmentation channel (per I8). The
+  // `indexes.bindingAugmentations` map is the dedicated mutable
+  // append-only buffer for post-finalize hooks: inner `BindingRef[]`
+  // arrays here are NEVER frozen (unlike `indexes.bindings`, which
+  // `materializeBindings` freezes). Walkers consult both channels
+  // via `lookupBindingsAt`; we never need to consult or mutate
+  // `indexes.bindings`.
+  const augmentations = indexes.bindingAugmentations as Map<ScopeId, Map<string, BindingRef[]>>;
 
   // Cross-namespace type-binding propagation: for each file, mirror
   // method return-type bindings from same-namespace sibling files and
@@ -301,17 +310,13 @@ export function populateCsharpNamespaceSiblings(
         const simpleName = mq.includes('.') ? mq.slice(mq.lastIndexOf('.') + 1) : mq;
         if (simpleName === '') continue;
 
-        // Add to `indexes.bindings[moduleScope]` so
-        // `findCallableBindingInScope` picks it up.
-        let scopeBindings = finalized.get(moduleScope.id);
-        if (scopeBindings === undefined) {
-          scopeBindings = new Map<string, BindingRef[]>();
-          finalized.set(moduleScope.id, scopeBindings);
-        }
-        const existing = scopeBindings.get(simpleName) ?? [];
-        if (existing.some((b) => b.def.nodeId === memberDef.nodeId)) continue;
-        existing.push({ def: memberDef, origin: 'import' });
-        scopeBindings.set(simpleName, existing);
+        // Append to the augmentation bucket for the importer's module
+        // scope. `findCallableBindingInScope` reads via
+        // `lookupBindingsAt`, which fans out across `bindings` +
+        // `bindingAugmentations`.
+        const bucketArr = getAugmentationBucket(augmentations, moduleScope.id, simpleName);
+        if (bucketArr.some((b) => b.def.nodeId === memberDef.nodeId)) continue;
+        bucketArr.push({ def: memberDef, origin: 'import' });
       }
     }
   }
@@ -337,15 +342,9 @@ export function populateCsharpNamespaceSiblings(
         const q = def.qualifiedName ?? '';
         const simpleName = q.includes('.') ? q.slice(q.lastIndexOf('.') + 1) : q;
         if (simpleName === '') continue;
-        let scopeBindings = finalized.get(moduleScope.id);
-        if (scopeBindings === undefined) {
-          scopeBindings = new Map<string, BindingRef[]>();
-          finalized.set(moduleScope.id, scopeBindings);
-        }
-        const existing = scopeBindings.get(simpleName) ?? [];
-        if (existing.some((b) => b.def.nodeId === def.nodeId)) continue;
-        existing.push({ def, origin: 'namespace' });
-        scopeBindings.set(simpleName, existing);
+        const bucketArr = getAugmentationBucket(augmentations, moduleScope.id, simpleName);
+        if (bucketArr.some((b) => b.def.nodeId === def.nodeId)) continue;
+        bucketArr.push({ def, origin: 'namespace' });
       }
     }
   }
@@ -366,11 +365,6 @@ export function populateCsharpNamespaceSiblings(
     }
 
     for (const { scopeId, filePath } of bucket.scopes) {
-      let scopeBindings = finalized.get(scopeId);
-      if (scopeBindings === undefined) {
-        scopeBindings = new Map<string, BindingRef[]>();
-        finalized.set(scopeId, scopeBindings);
-      }
       for (const [name, defs] of defsByName) {
         // Skip names already present locally — `origin: 'local'` in
         // scope.bindings would naturally shadow the cross-file
@@ -378,18 +372,42 @@ export function populateCsharpNamespaceSiblings(
         const local = bucket.scopes.find((s) => s.filePath === filePath)?.scope.bindings.get(name);
         if (local !== undefined && local.some((b) => b.origin === 'local')) continue;
 
-        const existing = scopeBindings.get(name) ?? [];
+        let bucketArr: BindingRef[] | null = null;
         for (const def of defs) {
           if (def.filePath === filePath) continue; // don't self-reference
-          if (existing.some((b) => b.def.nodeId === def.nodeId)) continue;
-          existing.push({ def, origin: 'namespace' });
+          if (bucketArr === null) bucketArr = getAugmentationBucket(augmentations, scopeId, name);
+          if (bucketArr.some((b) => b.def.nodeId === def.nodeId)) continue;
+          bucketArr.push({ def, origin: 'namespace' });
         }
-        if (existing.length > 0) scopeBindings.set(name, existing);
       }
     }
   }
 }
 
+/** Get-or-create a mutable inner bucket inside the `bindingAugmentations`
+ *  channel. The inner arrays here are mutable by contract (see
+ *  `ScopeResolutionIndexes.bindingAugmentations` doc + scope-resolver I8);
+ *  callers may `push` directly. Allocating the outer/inner Maps lazily
+ *  keeps the augmentation footprint zero for files with no cross-file
+ *  fanout. */
+function getAugmentationBucket(
+  augmentations: Map<ScopeId, Map<string, BindingRef[]>>,
+  scopeId: ScopeId,
+  name: string,
+): BindingRef[] {
+  let scopeBindings = augmentations.get(scopeId);
+  if (scopeBindings === undefined) {
+    scopeBindings = new Map<string, BindingRef[]>();
+    augmentations.set(scopeId, scopeBindings);
+  }
+  let bucketArr = scopeBindings.get(name);
+  if (bucketArr === undefined) {
+    bucketArr = [];
+    scopeBindings.set(name, bucketArr);
+  }
+  return bucketArr;
+}
+
 function isTypeDef(def: SymbolDefinition): boolean {
   return (
     def.type === 'Class' ||
diff --git a/gitnexus/src/core/ingestion/languages/python/captures.ts b/gitnexus/src/core/ingestion/languages/python/captures.ts
index e96a60644f..9653c7b9bf 100644
--- a/gitnexus/src/core/ingestion/languages/python/captures.ts
+++ b/gitnexus/src/core/ingestion/languages/python/captures.ts
@@ -23,6 +23,7 @@ import { getPythonParser, getPythonScopeQuery } from './query.js';
 import { synthesizeReceiverTypeBinding } from './receiver-binding.js';
 import { computePythonArityMetadata } from './arity-metadata.js';
 import { recordCacheHit, recordCacheMiss } from './cache-stats.js';
+import { getTreeSitterBufferSize } from '../../constants.js';
 
 export function emitPythonScopeCaptures(
   sourceText: string,
@@ -36,7 +37,9 @@ export function emitPythonScopeCaptures(
   // here at the use site.
   let tree = cachedTree as ReturnType<ReturnType<typeof getPythonParser>['parse']> | undefined;
   if (tree === undefined) {
-    tree = getPythonParser().parse(sourceText);
+    tree = getPythonParser().parse(sourceText, undefined, {
+      bufferSize: getTreeSitterBufferSize(sourceText),
+    });
     recordCacheMiss();
   } else {
     recordCacheHit();
diff --git a/gitnexus/src/core/ingestion/languages/typescript/captures.ts b/gitnexus/src/core/ingestion/languages/typescript/captures.ts
index 1b60fb6bdc..e7bb916988 100644
--- a/gitnexus/src/core/ingestion/languages/typescript/captures.ts
+++ b/gitnexus/src/core/ingestion/languages/typescript/captures.ts
@@ -37,6 +37,7 @@ import { getTsParser, getTsScopeQuery, tsCachedTreeMatchesGrammar } from './quer
 import { recordCacheHit, recordCacheMiss } from './cache-stats.js';
 import { synthesizeTsReceiverBinding } from './receiver-binding.js';
 import { computeTsArityMetadata } from './arity-metadata.js';
+import { getTreeSitterBufferSize } from '../../constants.js';
 
 /** tree-sitter-typescript node types for function-like scopes that may
  *  carry a synthesized `this` binding. Kept in sync with the
@@ -125,7 +126,9 @@ export function emitTsScopeCaptures(
     tree = undefined;
   }
   if (tree === undefined) {
-    tree = getTsParser(filePath).parse(sourceText);
+    tree = getTsParser(filePath).parse(sourceText, undefined, {
+      bufferSize: getTreeSitterBufferSize(sourceText),
+    });
     recordCacheMiss();
   } else {
     recordCacheHit();
diff --git a/gitnexus/src/core/ingestion/model/scope-resolution-indexes.ts b/gitnexus/src/core/ingestion/model/scope-resolution-indexes.ts
index 67e32fc0e8..a3fba7b302 100644
--- a/gitnexus/src/core/ingestion/model/scope-resolution-indexes.ts
+++ b/gitnexus/src/core/ingestion/model/scope-resolution-indexes.ts
@@ -62,8 +62,21 @@ export interface ScopeResolutionIndexes {
   readonly methodDispatch: MethodDispatchIndex;
   /** Finalized `ImportEdge[]` per module scope. */
   readonly imports: ReadonlyMap<ScopeId, readonly ImportEdge[]>;
-  /** Merged bindings (local + imports + wildcards) per module scope. */
+  /** Finalize-output bindings (local + imports + wildcards) per module scope.
+   *  Inner `BindingRef[]` arrays are frozen by `materializeBindings`;
+   *  this channel is permanently immutable post-finalize. Consumers
+   *  MUST read via `lookupBindingsAt` so the augmentation channel is
+   *  consulted alongside. See I8 in `contract/scope-resolver.ts`. */
   readonly bindings: ReadonlyMap<ScopeId, ReadonlyMap<string, readonly BindingRef[]>>;
+  /** Append-only post-finalize augmentation channel. Populated by
+   *  language hooks such as `populateNamespaceSiblings` for cross-file
+   *  bindings synthesized after finalize (e.g. C# same-namespace
+   *  visibility, `using static` member exposure). Inner arrays are
+   *  NOT frozen — hooks `push()` directly. Walkers must consult both
+   *  this map and `bindings` via `lookupBindingsAt`; finalized refs
+   *  are returned first and win duplicate `def.nodeId` metadata, with
+   *  unique augmentations appended after. See I8. */
+  readonly bindingAugmentations: ReadonlyMap<ScopeId, ReadonlyMap<string, readonly BindingRef[]>>;
   /** Pre-resolution usage facts; consumed by the resolution phase. */
   readonly referenceSites: readonly ReferenceSite[];
   /** SCC condensation of the file-level import graph — callers that want
diff --git a/gitnexus/src/core/ingestion/parsing-processor.ts b/gitnexus/src/core/ingestion/parsing-processor.ts
index d3395e782b..4756bcd659 100644
--- a/gitnexus/src/core/ingestion/parsing-processor.ts
+++ b/gitnexus/src/core/ingestion/parsing-processor.ts
@@ -48,7 +48,11 @@ import type {
   FileScopeBindings,
   ExtractedORMQuery,
 } from './workers/parse-worker.js';
-import { getTreeSitterBufferSize, TREE_SITTER_MAX_BUFFER } from './constants.js';
+import {
+  getTreeSitterBufferSize,
+  getTreeSitterContentByteLength,
+  TREE_SITTER_MAX_BUFFER,
+} from './constants.js';
 
 export type FileProgressCallback = (current: number, total: number, filePath: string) => void;
 
@@ -352,7 +356,7 @@ const processParsingSequential = async (
     }
 
     // Skip files larger than the max tree-sitter buffer (32 MB)
-    if (file.content.length > TREE_SITTER_MAX_BUFFER) continue;
+    if (getTreeSitterContentByteLength(file.content) > TREE_SITTER_MAX_BUFFER) continue;
 
     // Vue SFC preprocessing: extract <script> block content
     let parseContent = file.content;
@@ -375,7 +379,7 @@ const processParsingSequential = async (
     let tree: Parser.Tree;
     try {
       tree = parser.parse(parseContent, undefined, {
-        bufferSize: getTreeSitterBufferSize(parseContent.length),
+        bufferSize: getTreeSitterBufferSize(parseContent),
       });
     } catch (parseError) {
       console.warn(`Skipping unparseable file: ${file.path}`);
diff --git a/gitnexus/src/core/ingestion/scope-resolution/contract/scope-resolver.ts b/gitnexus/src/core/ingestion/scope-resolution/contract/scope-resolver.ts
index b50c0a6fd0..071eb588d9 100644
--- a/gitnexus/src/core/ingestion/scope-resolution/contract/scope-resolver.ts
+++ b/gitnexus/src/core/ingestion/scope-resolution/contract/scope-resolver.ts
@@ -136,14 +136,45 @@
  *     once per workspace at resolve time), and merging would create a
  *     god-interface that complicates future migrations.
  *
- *   - **I8 — Post-finalize hooks may mutate `Scope.typeBindings` and
- *     `indexes.bindings`.** `propagateImportedReturnTypes` and
- *     `populateNamespaceSiblings` both write to these structures via
- *     `as Map<...>` casts through `ReadonlyMap` facades. Downstream
- *     consumers MUST NOT freeze or snapshot these maps before all
- *     post-finalize hooks have run. The `ReadonlyMap<...>` type on
- *     `ScopeResolutionIndexes` is a read-guidance surface for
- *     consumers, NOT an immutability promise during the resolve phase.
+ *   - **I8 — Two-channel binding lifecycle.**
+ *     `indexes.bindings` is the **finalize-output channel**. After
+ *     `finalizeScopeModel` returns, its inner `BindingRef[]` arrays
+ *     are deep-frozen by `materializeBindings` and MUST NOT be
+ *     mutated by any post-finalize hook. Treat `indexes.bindings` as
+ *     immutable from the moment `finalizeScopeModel` returns.
+ *
+ *     `indexes.bindingAugmentations` is the **post-finalize
+ *     append-only channel**. Hooks like `populateNamespaceSiblings`
+ *     append cross-file bindings synthesized after finalize (C#
+ *     same-namespace visibility, `using static` member exposure)
+ *     into this channel, NOT into `indexes.bindings`. Inner arrays
+ *     here are NEVER frozen — hooks `push()` directly. Any consumer
+ *     that reads post-finalize workspace bindings MUST query both
+ *     index channels via `lookupBindingsAt`
+ *     (`scope-resolution/scope/walkers.ts`); the helper returns
+ *     finalized refs first, appends unique augmentation refs after,
+ *     and dedupes by `def.nodeId` so finalized metadata wins on
+ *     duplicate defs. Per-`Scope.bindings` local declarations are the
+ *     lexical extraction channel and remain a separate first-tier
+ *     lookup for local shadowing.
+ *
+ *     `Scope.typeBindings` remains mutable post-finalize per I6 (it
+ *     is intentionally not frozen at any point).
+ *
+ *     The `ReadonlyMap<...>` types on `ScopeResolutionIndexes` are
+ *     compile-time read-guidance for consumers; structural mutation
+ *     of `bindingAugmentations` is performed via a deliberate
+ *     `as Map<...>` cast inside the hook implementations and is the
+ *     ONLY sanctioned channel for post-finalize binding fanout.
+ *
+ *     The dev-mode runtime validator
+ *     (`validateBindingsImmutability` in
+ *     `scope-resolution/validate-bindings-immutability.ts`) surfaces
+ *     any drift — i.e. a hook writing to `indexes.bindings` instead
+ *     of `bindingAugmentations`, or producing a non-frozen finalized
+ *     bucket — via `onWarn` when explicitly enabled by
+ *     `NODE_ENV === 'development' || VALIDATE_SEMANTIC_MODEL === '1'`
+ *     (`VALIDATE_SEMANTIC_MODEL=0` is an explicit off switch).
  *
  *   - **I9 — `SemanticModel` is the single authoritative symbol store.**
  *     Every symbol-indexed lookup (key = `nodeId | simpleName |
diff --git a/gitnexus/src/core/ingestion/scope-resolution/passes/imported-return-types.ts b/gitnexus/src/core/ingestion/scope-resolution/passes/imported-return-types.ts
index 62326077cf..3ad9a28ae1 100644
--- a/gitnexus/src/core/ingestion/scope-resolution/passes/imported-return-types.ts
+++ b/gitnexus/src/core/ingestion/scope-resolution/passes/imported-return-types.ts
@@ -42,6 +42,7 @@
 import type { ParsedFile, ScopeId, TypeRef } from 'gitnexus-shared';
 import type { ScopeResolutionIndexes } from '../../model/scope-resolution-indexes.js';
 import type { WorkspaceResolutionIndex } from '../workspace-index.js';
+import { lookupBindingsAt, namesAtScope } from '../scope/walkers.js';
 
 /**
  * Max chain depth for the post-finalize re-follow. Effective end-to-end
@@ -136,14 +137,19 @@ export function propagateImportedReturnTypes(
     for (const filePath of scc.files) {
       const importerModule = moduleScopeByFile.get(filePath);
       if (importerModule === undefined) continue;
-      const finalizedBindings = indexes.bindings.get(importerModule.id);
-      if (finalizedBindings === undefined) continue;
 
-      for (const [localName, refs] of finalizedBindings) {
+      // Iterate finalized + augmented binding names at this scope so
+      // post-finalize hooks (e.g. `using static` augmentations from
+      // `populateCsharpNamespaceSiblings`) are visible to the
+      // import-derived typeBinding mirror. Both helpers fast-path when
+      // no augmentations exist for the scope, so the common case is
+      // allocation-free. See I8.
+      for (const localName of namesAtScope(importerModule.id, indexes)) {
         // Skip if importer already has a typeBinding for this name —
         // an explicit local annotation must win over import-derived.
         if (importerModule.typeBindings.has(localName)) continue;
 
+        const refs = lookupBindingsAt(importerModule.id, localName, indexes);
         for (const ref of refs) {
           if (ref.origin !== 'import' && ref.origin !== 'reexport') continue;
           const sourceModule = moduleScopeByFile.get(ref.def.filePath);
diff --git a/gitnexus/src/core/ingestion/scope-resolution/pipeline/phase.ts b/gitnexus/src/core/ingestion/scope-resolution/pipeline/phase.ts
index 17c541559e..5dbb3715fb 100644
--- a/gitnexus/src/core/ingestion/scope-resolution/pipeline/phase.ts
+++ b/gitnexus/src/core/ingestion/scope-resolution/pipeline/phase.ts
@@ -36,7 +36,7 @@ import { SupportedLanguages, getLanguageFromFilename } from 'gitnexus-shared';
 import { readFileContents } from '../../filesystem-walker.js';
 import { runScopeResolution } from './run.js';
 import { SCOPE_RESOLVERS } from './registry.js';
-import { isDev } from '../../utils/env.js';
+import { isDev, isSemanticModelValidatorEnabled } from '../../utils/env.js';
 
 export interface ScopeResolutionOutput {
   /** True when at least one language ran. */
@@ -143,7 +143,9 @@ export const scopeResolutionPhase: PipelinePhase<ScopeResolutionOutput> = {
           treeCache: scopeTreeCache,
           resolutionConfig,
           onWarn: (msg) => {
-            if (isDev) console.warn(`[scope-resolution:${lang}] ${msg}`);
+            if (isSemanticModelValidatorEnabled()) {
+              console.warn(`[scope-resolution:${lang}] ${msg}`);
+            }
           },
         },
         provider,
diff --git a/gitnexus/src/core/ingestion/scope-resolution/pipeline/run.ts b/gitnexus/src/core/ingestion/scope-resolution/pipeline/run.ts
index 372417a0dd..feebf24057 100644
--- a/gitnexus/src/core/ingestion/scope-resolution/pipeline/run.ts
+++ b/gitnexus/src/core/ingestion/scope-resolution/pipeline/run.ts
@@ -27,6 +27,7 @@ import type { ParsedFile, RegistryProviders } from 'gitnexus-shared';
 import type { KnowledgeGraph } from '../../../graph/types.js';
 import type { MutableSemanticModel, SemanticModel } from '../../model/semantic-model.js';
 import { reconcileOwnership, validateOwnershipParity } from './reconcile-ownership.js';
+import { validateBindingsImmutability } from './validate-bindings-immutability.js';
 import { extractParsedFile } from '../../scope-extractor-bridge.js';
 import { finalizeScopeModel } from '../../finalize-orchestrator.js';
 import { resolveReferenceSites, type ResolveStats } from '../../resolve-references.js';
@@ -174,6 +175,8 @@ export function runScopeResolution(
   // Cross-file implicit-namespace visibility (C#). Must run before
   // propagateImportedReturnTypes so the latter pass sees siblings'
   // class bindings when chasing return-type chains across files.
+  // The hook writes to `bindingAugmentations` only; finalized
+  // `indexes.bindings` remains immutable post-finalize (I8).
   if (provider.populateNamespaceSiblings !== undefined) {
     const fileContents = new Map<string, string>();
     for (const f of files) fileContents.set(f.path, f.content);
@@ -195,6 +198,14 @@ export function runScopeResolution(
   }
   const tPropagate = PROF ? process.hrtime.bigint() : 0n;
 
+  // Opt-in I8 invariant guard. Runs once after all post-finalize hooks
+  // (`populateNamespaceSiblings`, `propagateImportedReturnTypes`) have
+  // had a chance to drift, so a single sweep covers the full
+  // post-finalize surface visible to `resolveReferenceSites`. No-op in
+  // default CLI runs; enabled by NODE_ENV=development or
+  // VALIDATE_SEMANTIC_MODEL=1.
+  validateBindingsImmutability(indexes, onWarn);
+
   // ── Phase 3: resolve references via Registry.lookup ────────────────────
   const registryProviders: RegistryProviders = {
     arityCompatibility: provider.arityCompatibility,
diff --git a/gitnexus/src/core/ingestion/scope-resolution/pipeline/validate-bindings-immutability.ts b/gitnexus/src/core/ingestion/scope-resolution/pipeline/validate-bindings-immutability.ts
new file mode 100644
index 0000000000..60e5fe179e
--- /dev/null
+++ b/gitnexus/src/core/ingestion/scope-resolution/pipeline/validate-bindings-immutability.ts
@@ -0,0 +1,78 @@
+/**
+ * Dev-mode runtime validator for the two-channel binding lifecycle
+ * (Contract Invariant I8 in `contract/scope-resolver.ts`).
+ *
+ * The two channels:
+ *   - `indexes.bindings` — finalize-output channel. After
+ *     `finalizeScopeModel` returns, every inner `BindingRef[]` array
+ *     here is deep-frozen by `materializeBindings`. NO post-finalize
+ *     hook should ever mutate this map's inner arrays — drift here
+ *     manifests at runtime as the `Cannot add property N, object is
+ *     not extensible` crash (issue #1066) or, more insidiously, as
+ *     a hook silently mutating one of the frozen arrays (a no-op in
+ *     production where freezes can be elided, a `TypeError` in dev).
+ *
+ *   - `indexes.bindingAugmentations` — post-finalize append-only
+ *     channel. Inner arrays here are NEVER frozen; hooks like
+ *     `populateNamespaceSiblings` `push()` directly. Walkers consult
+ *     both channels via `lookupBindingsAt`.
+ *
+ * This validator runs after every post-finalize hook has executed
+ * (so the dev-mode envelope captures the FULL surface area visible
+ * to `resolveReferenceSites`) and asserts:
+ *
+ *   1. Every inner `BindingRef[]` array in `indexes.bindings` is
+ *      `Object.isFrozen` — i.e. finalize produced a frozen bucket
+ *      AND no hook accidentally `set()`-back a mutable replacement.
+ *
+ *   2. Every inner `BindingRef[]` array in
+ *      `indexes.bindingAugmentations` is NOT frozen — i.e. the
+ *      hook used the augmentation channel as designed (mutable
+ *      `push()`) and didn't accidentally freeze its own scratch
+ *      arrays. Self-documenting; mostly a sanity net.
+ *
+ * Mirrors `validateOwnershipParity` (#909): warns via `onWarn`,
+ * never throws, and is opt-in outside development. Gated by
+ * `isSemanticModelValidatorEnabled()` (`utils/env.ts`).
+ */
+
+import type { ScopeResolutionIndexes } from '../../model/scope-resolution-indexes.js';
+import { isSemanticModelValidatorEnabled } from '../../utils/env.js';
+
+export function validateBindingsImmutability(
+  indexes: ScopeResolutionIndexes,
+  onWarn: (message: string) => void,
+): number {
+  if (!isSemanticModelValidatorEnabled()) return 0;
+
+  let violations = 0;
+
+  for (const [scopeId, bucketMap] of indexes.bindings) {
+    for (const [name, bucket] of bucketMap) {
+      if (!Object.isFrozen(bucket)) {
+        onWarn(
+          `binding-immutability: indexes.bindings[${scopeId}][${name}] is NOT frozen — ` +
+            `finalize produced a mutable bucket OR a post-finalize hook replaced a frozen ` +
+            `bucket with a mutable one. Hooks must write to indexes.bindingAugmentations ` +
+            `instead. See ScopeResolver Invariant I8.`,
+        );
+        violations++;
+      }
+    }
+  }
+
+  for (const [scopeId, bucketMap] of indexes.bindingAugmentations) {
+    for (const [name, bucket] of bucketMap) {
+      if (Object.isFrozen(bucket)) {
+        onWarn(
+          `binding-immutability: indexes.bindingAugmentations[${scopeId}][${name}] is FROZEN — ` +
+            `the augmentation channel is mutable by contract; freezing it defeats the ` +
+            `append-only purpose. See ScopeResolver Invariant I8.`,
+        );
+        violations++;
+      }
+    }
+  }
+
+  return violations;
+}
diff --git a/gitnexus/src/core/ingestion/scope-resolution/scope/walkers.ts b/gitnexus/src/core/ingestion/scope-resolution/scope/walkers.ts
index 13b52f2800..27298328c1 100644
--- a/gitnexus/src/core/ingestion/scope-resolution/scope/walkers.ts
+++ b/gitnexus/src/core/ingestion/scope-resolution/scope/walkers.ts
@@ -1,13 +1,14 @@
 /**
  * Scope-chain lookup primitives shared across language providers.
  *
- * Four functions:
+ * Five functions:
  *   - `findReceiverTypeBinding` — walk scope.typeBindings up the chain
  *     for a receiver name.
- *   - `findClassBindingInScope` — walk scope.bindings + indexes.bindings
- *     (pre-finalize + post-finalize) for a class-kind binding. Dual-
- *     source is required because the cross-file finalize pass produces
- *     a separate bindings map that is not merged back into scope.bindings.
+ *   - `lookupBindingsAt` — read finalized + augmented binding refs at
+ *     one scope, deduped by `def.nodeId`. The dual-source-aware
+ *     primitive every other binding lookup composes with.
+ *   - `findClassBindingInScope` — walk scope.bindings + the indexes via
+ *     `lookupBindingsAt` for a class-kind binding.
  *   - `findOwnedMember` — find a method/field owned by a class def
  *     across all parsed files by (ownerId, simpleName).
  *   - `findExportedDef` — find a file-level exported def (top-of-module
@@ -19,11 +20,85 @@
  * as-is for TypeScript, Java, Kotlin, Ruby, etc.
  */
 
-import type { ParsedFile, ScopeId, SymbolDefinition, TypeRef } from 'gitnexus-shared';
+import type { BindingRef, ParsedFile, ScopeId, SymbolDefinition, TypeRef } from 'gitnexus-shared';
 import type { ScopeResolutionIndexes } from '../../model/scope-resolution-indexes.js';
 import type { SemanticModel } from '../../model/semantic-model.js';
 import type { WorkspaceResolutionIndex } from '../workspace-index.js';
 
+const EMPTY_BINDINGS: readonly BindingRef[] = Object.freeze([]);
+
+/**
+ * Look up binding refs at `scopeId` for `name`, consulting both the
+ * finalize-owned `bindings` channel and the post-finalize
+ * `bindingAugmentations` channel (see invariant I8 in
+ * `contract/scope-resolver.ts`). Finalized refs come first; augmented
+ * refs append, deduped by `def.nodeId` so a sibling that's also
+ * explicitly imported doesn't double-emit.
+ *
+ * Returns a shared frozen empty array when neither channel has the
+ * name — callers can compare against `=== EMPTY_BINDINGS` if they
+ * want a fast-path miss check. The bucket arrays are returned by
+ * reference when only one channel populates them; the merged path
+ * allocates a fresh array.
+ *
+ * Walker primitives (`findClassBindingInScope`,
+ * `findCallableBindingInScope`, `findExportedDefByName`) and
+ * post-finalize passes that read finalized bindings (e.g.
+ * `propagateImportedReturnTypes`, `namespace-targets`) MUST go
+ * through this helper instead of `scopes.bindings.get(...)` directly,
+ * so the augmentation channel is always visible.
+ */
+export function lookupBindingsAt(
+  scopeId: ScopeId,
+  name: string,
+  scopes: ScopeResolutionIndexes,
+): readonly BindingRef[] {
+  const finalized = scopes.bindings.get(scopeId)?.get(name);
+  const augmented = scopes.bindingAugmentations.get(scopeId)?.get(name);
+  const fLen = finalized?.length ?? 0;
+  const aLen = augmented?.length ?? 0;
+  if (fLen === 0 && aLen === 0) return EMPTY_BINDINGS;
+  if (aLen === 0) return finalized!;
+  if (fLen === 0) return augmented!;
+  const seen = new Set<string>();
+  const out: BindingRef[] = [];
+  for (const r of finalized!) {
+    seen.add(r.def.nodeId);
+    out.push(r);
+  }
+  for (const r of augmented!) {
+    if (seen.has(r.def.nodeId)) continue;
+    out.push(r);
+  }
+  return out;
+}
+
+const EMPTY_NAMES: Iterable<string> = Object.freeze([]) as readonly string[];
+
+/**
+ * Return the union of bound names at `scopeId` across both the
+ * finalized and augmented channels. Companion to `lookupBindingsAt`
+ * for callers that need to iterate every name at a scope (e.g.
+ * `propagateImportedReturnTypes`). Order is not guaranteed; callers
+ * that need stable iteration should sort externally.
+ *
+ * Fast paths (zero allocation) when at most one channel is populated:
+ * returns the underlying `Map.keys()` iterator directly. Only when both
+ * channels carry names do we materialize a `Set` for deduplication.
+ */
+export function namesAtScope(scopeId: ScopeId, scopes: ScopeResolutionIndexes): Iterable<string> {
+  const finalized = scopes.bindings.get(scopeId);
+  const augmented = scopes.bindingAugmentations.get(scopeId);
+  const fSize = finalized?.size ?? 0;
+  const aSize = augmented?.size ?? 0;
+  if (fSize === 0 && aSize === 0) return EMPTY_NAMES;
+  if (aSize === 0) return finalized!.keys();
+  if (fSize === 0) return augmented!.keys();
+  const out = new Set<string>(finalized!.keys());
+  for (const name of augmented!.keys()) out.add(name);
+  return out;
+}
+
 /**
  * True when a def's `type` names a class-like declaration — every kind
  * that collapses to `@scope.class` in the scope-extractor query contract.
@@ -78,8 +153,10 @@ export function findReceiverTypeBinding(
  * Walks the scope chain upward and consults TWO sources at each step:
  *   1. `scope.bindings` — populated during scope-extraction Pass 2 with
  *      local declarations (`origin: 'local'`).
- *   2. `indexes.bindings` — populated by the cross-file finalize pass
- *      with import/namespace/wildcard/reexport origins.
+ *   2. The cross-file finalized + augmented bindings, via
+ *      `lookupBindingsAt` (per I8: finalized = canonical immutable
+ *      output; augmented = post-finalize hooks like
+ *      `populateNamespaceSiblings`).
  *
  * Without (2) we'd miss every cross-file class-receiver call.
  */
@@ -103,12 +180,9 @@ export function findClassBindingInScope(
       }
     }
 
-    const finalizedScopeBindings = scopes.bindings.get(currentId);
-    const importedBindings = finalizedScopeBindings?.get(receiverName);
-    if (importedBindings !== undefined) {
-      for (const b of importedBindings) {
-        if (isClassLike(b.def.type)) return b.def;
-      }
+    const importedBindings = lookupBindingsAt(currentId, receiverName, scopes);
+    for (const b of importedBindings) {
+      if (isClassLike(b.def.type)) return b.def;
     }
 
     currentId = scope.parent;
@@ -119,8 +193,9 @@ export function findClassBindingInScope(
 /**
  * Look up a callable (Function/Method/Constructor) by name in the
  * given scope's chain. Uses the dual-source pattern (scope.bindings +
- * indexes.bindings) so cross-file imports are visible — without it
- * free calls to imported functions never resolve via the post-pass.
+ * `lookupBindingsAt` for finalized + augmented) so cross-file
+ * imports are visible — without it free calls to imported functions
+ * never resolve via the post-pass.
  *
  * Mirrors `findClassBindingInScope` exactly; only the accepted
  * def-type predicate differs.
@@ -147,13 +222,10 @@ export function findCallableBindingInScope(
       }
     }
 
-    const finalizedScopeBindings = scopes.bindings.get(currentId);
-    const importedBindings = finalizedScopeBindings?.get(callableName);
-    if (importedBindings !== undefined) {
-      for (const b of importedBindings) {
-        if (b.def.type === 'Function' || b.def.type === 'Method' || b.def.type === 'Constructor') {
-          return b.def;
-        }
+    const importedBindings = lookupBindingsAt(currentId, callableName, scopes);
+    for (const b of importedBindings) {
+      if (b.def.type === 'Function' || b.def.type === 'Method' || b.def.type === 'Constructor') {
+        return b.def;
       }
     }
 
@@ -294,11 +366,9 @@ export function findExportedDefByName(
         if (b.def.type === 'Function' || b.def.type === 'Method') return b.def;
       }
     }
-    const finalized = scopes.bindings.get(currentId)?.get(name);
-    if (finalized !== undefined) {
-      for (const b of finalized) {
-        if (b.def.type === 'Function' || b.def.type === 'Method') return b.def;
-      }
+    const finalized = lookupBindingsAt(currentId, name, scopes);
+    for (const b of finalized) {
+      if (b.def.type === 'Function' || b.def.type === 'Method') return b.def;
     }
     currentId = scope.parent;
   }
@@ -355,7 +425,12 @@ export function findOwnedMember(
  * excluded.
  *
  * Reads from `WorkspaceResolutionIndex.moduleScopeByFile` (scope-tied
- * lookup that doesn't live on `SemanticModel`).
+ * lookup that doesn't live on `SemanticModel`). This intentionally
+ * does NOT call `lookupBindingsAt`: `findExportedDef` answers "what
+ * did the target file declare locally at module scope?", while
+ * `bindingAugmentations` models importer-side visibility created by
+ * post-finalize hooks. Callers that need importer-visible exports use
+ * `findExportedDefByName`, which is dual-channel aware.
  */
 export function findExportedDef(
   targetFile: string,
diff --git a/gitnexus/src/core/ingestion/utils/env.ts b/gitnexus/src/core/ingestion/utils/env.ts
index b54a7d600a..6cb9d549f9 100644
--- a/gitnexus/src/core/ingestion/utils/env.ts
+++ b/gitnexus/src/core/ingestion/utils/env.ts
@@ -9,3 +9,17 @@
 
 /** Whether we're running in development mode (enables verbose console logging). */
 export const isDev = process.env.NODE_ENV === 'development';
+
+/**
+ * Whether scope-resolution dev validators (e.g. `validateBindingsImmutability`)
+ * should run AND emit warnings. Off by default in CLI runs to avoid silent
+ * O(n) scans on large repos; on in `NODE_ENV=development` or when explicitly
+ * opted-in via `VALIDATE_SEMANTIC_MODEL=1`. `VALIDATE_SEMANTIC_MODEL=0` is the
+ * explicit off switch and wins over both.
+ *
+ * Read every call (not memoized) so test setups using `vi.stubEnv` work.
+ */
+export const isSemanticModelValidatorEnabled = (): boolean => {
+  if (process.env.VALIDATE_SEMANTIC_MODEL === '0') return false;
+  return process.env.NODE_ENV === 'development' || process.env.VALIDATE_SEMANTIC_MODEL === '1';
+};
diff --git a/gitnexus/src/core/ingestion/workers/parse-worker.ts b/gitnexus/src/core/ingestion/workers/parse-worker.ts
index 625f0d75de..49cc997b28 100644
--- a/gitnexus/src/core/ingestion/workers/parse-worker.ts
+++ b/gitnexus/src/core/ingestion/workers/parse-worker.ts
@@ -15,7 +15,11 @@ import Ruby from 'tree-sitter-ruby';
 import { createRequire } from 'node:module';
 import { SupportedLanguages } from 'gitnexus-shared';
 import { getProvider } from '../languages/index.js';
-import { getTreeSitterBufferSize, TREE_SITTER_MAX_BUFFER } from '../constants.js';
+import {
+  getTreeSitterBufferSize,
+  getTreeSitterContentByteLength,
+  TREE_SITTER_MAX_BUFFER,
+} from '../constants.js';
 import type { SymbolTableReader } from '../model/symbol-table.js';
 import type { ExtractedHeritage } from '../model/heritage-map.js';
 
@@ -1383,7 +1387,7 @@ const processFileGroup = (
 
   for (const file of files) {
     // Skip files larger than the max tree-sitter buffer (32 MB)
-    if (file.content.length > TREE_SITTER_MAX_BUFFER) continue;
+    if (getTreeSitterContentByteLength(file.content) > TREE_SITTER_MAX_BUFFER) continue;
 
     // Vue SFC preprocessing: extract <script> block content
     let parseContent = file.content;
@@ -1402,7 +1406,7 @@ const processFileGroup = (
     let tree;
     try {
       tree = parser.parse(parseContent, undefined, {
-        bufferSize: getTreeSitterBufferSize(parseContent.length),
+        bufferSize: getTreeSitterBufferSize(parseContent),
       });
     } catch (err) {
       console.warn(
diff --git a/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/LargeCacheMissResolution.csproj b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/LargeCacheMissResolution.csproj
new file mode 100644
index 0000000000..ec2cce1432
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/LargeCacheMissResolution.csproj
@@ -0,0 +1,5 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+  </PropertyGroup>
+</Project>
diff --git a/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Models/User.cs b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Models/User.cs
new file mode 100644
index 0000000000..e23a122526
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Models/User.cs
@@ -0,0 +1,6 @@
+namespace App.Models;
+
+public class User
+{
+    public void Save() { }
+}
diff --git a/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Other/Helper.cs b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Other/Helper.cs
new file mode 100644
index 0000000000..7e655305e4
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Other/Helper.cs
@@ -0,0 +1,3 @@
+namespace App.Other;
+
+public class Helper { }
diff --git a/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Services/UserService.cs b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Services/UserService.cs
new file mode 100644
index 0000000000..0cdfb10400
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/csharp-large-cache-miss-resolution/Services/UserService.cs
@@ -0,0 +1,548 @@
+using App.Models;
+using App.Other;
+
+namespace App.Services;
+
+// ============================================================================
+// Regression fixture for GitNexus issue #1066 (PR #1050 follow-up).
+//
+// This file is intentionally larger than the 32 KB tree-sitter default buffer.
+// The scope-resolution phase reparses the file on cache miss (worker mode
+// can't share `Tree` instances across MessageChannels), so the cache-miss
+// path must use the adaptive `getTreeSitterBufferSize` rather than the
+// default. Without that, this file fails with `Invalid argument` and the
+// `CreateUser -> Save` CALLS edge below would silently disappear.
+//
+// In addition, this file declares a local `Helper` while also importing
+// `App.Other.Helper` via `using App.Other;`. Before the freeze fix in
+// `populateCsharpNamespaceSiblings`, the cross-namespace inject loop pushed
+// `App.Other.Helper` onto the frozen `bindings[module]['Helper']` bucket
+// produced by `finalize-algorithm.ts` (`Object.freeze(refs.slice())`),
+// throwing `Cannot add property N, object is not extensible` and aborting
+// the whole `scopeResolution` phase.
+//
+// Both regressions are exercised end-to-end through the full pipeline by
+// the resolver test in `test/integration/resolvers/csharp.test.ts`.
+// ============================================================================
+//
+// Padding section below — each line is a separate `comment` AST node so the
+// resolver pipeline treats them as a no-op while the source byte count
+// crosses the 32 KB threshold.
+// Pad 001 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 002 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 003 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 004 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 005 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 006 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 007 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 008 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 009 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 010 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 011 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 012 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 013 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 014 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 015 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 016 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 017 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 018 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 019 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 020 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 021 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 022 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 023 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 024 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 025 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 026 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 027 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 028 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 029 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 030 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 031 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 032 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 033 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 034 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 035 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 036 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 037 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 038 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 039 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 040 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 041 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 042 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 043 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 044 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 045 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 046 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 047 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 048 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 049 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 050 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 051 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 052 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 053 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 054 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 055 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 056 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 057 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 058 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 059 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 060 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 061 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 062 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 063 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 064 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 065 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 066 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 067 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 068 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 069 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 070 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 071 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 072 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 073 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 074 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 075 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 076 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 077 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 078 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 079 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 080 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 081 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 082 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 083 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 084 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 085 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 086 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 087 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 088 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 089 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 090 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 091 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 092 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 093 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 094 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 095 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 096 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 097 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 098 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 099 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 100 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 101 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 102 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 103 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 104 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 105 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 106 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 107 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 108 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 109 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 110 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 111 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 112 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 113 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
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+// Pad 331 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 332 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 333 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 334 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 335 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 336 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 337 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 338 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 339 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 340 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 341 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 342 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 343 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 344 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 345 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 346 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 347 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 348 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 349 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 350 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 351 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 352 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 353 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 354 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 355 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 356 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 357 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 358 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 359 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 360 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 361 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 362 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 363 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 364 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 365 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 366 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 367 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 368 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 369 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 370 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 371 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 372 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 373 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 374 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 375 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 376 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 377 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 378 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 379 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 380 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 381 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 382 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 383 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 384 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 385 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 386 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 387 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 388 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 389 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 390 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 391 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 392 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 393 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 394 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 395 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 396 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 397 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 398 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 399 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 400 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 401 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 402 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 403 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 404 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 405 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 406 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 407 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 408 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 409 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 410 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 411 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 412 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 413 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 414 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 415 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 416 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 417 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 418 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 419 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 420 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 421 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 422 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 423 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 424 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 425 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 426 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 427 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 428 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 429 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 430 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 431 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 432 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 433 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 434 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 435 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 436 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 437 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 438 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 439 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 440 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 441 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 442 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 443 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 444 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 445 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 446 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 447 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 448 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 449 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 450 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 451 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 452 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 453 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 454 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 455 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 456 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 457 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 458 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 459 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 460 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 461 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 462 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 463 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 464 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 465 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 466 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 467 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 468 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 469 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 470 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 471 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 472 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 473 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 474 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 475 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 476 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 477 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 478 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 479 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 480 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 481 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 482 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 483 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 484 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 485 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 486 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 487 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 488 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 489 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 490 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 491 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 492 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 493 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 494 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 495 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 496 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 497 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 498 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 499 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+// Pad 500 - large-file marker for issue #1066 cache-miss buffer regression. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
+
+// ============================================================================
+// Cross-namespace `using` plus a colliding local `Helper` together exercise
+// the frozen-bucket fix in populateCsharpNamespaceSiblings. The CreateUser
+// method below resolves `User` via same-namespace siblings (Models/User.cs)
+// and `user.Save()` via receiver-typed dispatch.
+// ============================================================================
+
+public class Helper { }
+
+public class UserService
+{
+    public void CreateUser()
+    {
+        var user = new User();
+        user.Save();
+    }
+}
\ No newline at end of file
diff --git a/gitnexus/test/integration/resolvers/csharp.test.ts b/gitnexus/test/integration/resolvers/csharp.test.ts
index c28f900312..b412ecc9a7 100644
--- a/gitnexus/test/integration/resolvers/csharp.test.ts
+++ b/gitnexus/test/integration/resolvers/csharp.test.ts
@@ -2420,3 +2420,68 @@ describe('C# class-name receiver write ACCESSES (merged Case 2 kind-aware branch
     expect(stray).toEqual([]);
   });
 });
+
+// ---------------------------------------------------------------------------
+// Issue #1066 regression: large source files (>32 KB) combined with a
+// cross-namespace `using` and a colliding local class. Pins both fixes in
+// the resolver dataset:
+//
+//   1. emitCsharpScopeCaptures + extractFileStructure must use the adaptive
+//      `getTreeSitterBufferSize` on cache miss, otherwise UserService.cs
+//      fails to reparse with "Invalid argument" and CreateUser is dropped.
+//   2. populateCsharpNamespaceSiblings must append to bindingAugmentations
+//      instead of mutating frozen finalize-produced BindingRef[] arrays;
+//      otherwise the cross-namespace inject loop throws "Cannot add property
+//      N, object is not extensible" when the importer also declares the same
+//      simple name locally.
+// ---------------------------------------------------------------------------
+
+describe('C# large-file + frozen-bucket regression (issue #1066)', () => {
+  let result: PipelineResult;
+
+  beforeAll(async () => {
+    // Force the worker pool path with low thresholds so the scope-resolution
+    // cache-miss reparse actually fires (workers can't share Tree instances
+    // across MessageChannels). This is what reproduces the >32 KB
+    // "Invalid argument" failure end-to-end through the pipeline.
+    result = await runPipelineFromRepo(
+      path.join(FIXTURES, 'csharp-large-cache-miss-resolution'),
+      () => {},
+      { workerThresholdsForTest: { minFiles: 1, minBytes: 0 } },
+    );
+  }, 120000);
+
+  it('extracts UserService.CreateUser despite the >32 KB source size', () => {
+    // Without the adaptive-buffer fix, UserService.cs would fail to reparse
+    // on cache miss and CreateUser would not be extracted at all.
+    expect(getNodesByLabel(result, 'Method')).toEqual(
+      expect.arrayContaining(['CreateUser', 'Save']),
+    );
+  });
+
+  it('detects all three classes (User, Helper, UserService)', () => {
+    expect(getNodesByLabel(result, 'Class')).toEqual(
+      expect.arrayContaining(['User', 'Helper', 'UserService']),
+    );
+  });
+
+  it('resolves CreateUser -> User constructor across same namespace', () => {
+    const calls = getRelationships(result, 'CALLS');
+    const ctor = calls.find(
+      (c) => c.source === 'CreateUser' && c.target === 'User' && c.targetLabel === 'Class',
+    );
+    expect(ctor).toBeDefined();
+    expect(ctor!.targetFilePath).toBe('Models/User.cs');
+  });
+
+  it('resolves CreateUser -> Save through namespace siblings', () => {
+    // Without the freeze fix, populateCsharpNamespaceSiblings throws on
+    // the colliding `Helper` bucket, aborting the whole scopeResolution
+    // phase, so no CALLS edges from CreateUser would be emitted at all.
+    const calls = getRelationships(result, 'CALLS');
+    const save = calls.find((c) => c.source === 'CreateUser' && c.target === 'Save');
+    expect(save).toBeDefined();
+    expect(save!.targetFilePath).toBe('Models/User.cs');
+    expect(['import-resolved', 'global']).toContain(save!.rel.reason);
+  });
+});
diff --git a/gitnexus/test/integration/resolvers/python.test.ts b/gitnexus/test/integration/resolvers/python.test.ts
index dc7ec42176..b645d808af 100644
--- a/gitnexus/test/integration/resolvers/python.test.ts
+++ b/gitnexus/test/integration/resolvers/python.test.ts
@@ -1,8 +1,10 @@
 /**
  * Python: relative imports + class inheritance + ambiguous module disambiguation
  */
-import { describe, it, expect, beforeAll } from 'vitest';
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
 import path from 'path';
+import fs from 'node:fs';
+import os from 'node:os';
 import {
   FIXTURES,
   CROSS_FILE_FIXTURES,
@@ -14,6 +16,14 @@ import {
   type PipelineResult,
 } from './helpers.js';
 
+function writeFixtureRepo(root: string, files: Record<string, string>): void {
+  for (const [relPath, content] of Object.entries(files)) {
+    const fullPath = path.join(root, relPath);
+    fs.mkdirSync(path.dirname(fullPath), { recursive: true });
+    fs.writeFileSync(fullPath, content, 'utf8');
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Heritage: relative imports + class inheritance
 // ---------------------------------------------------------------------------
@@ -2485,3 +2495,61 @@ describe('Python class-body namespace import feeds method receiver-bound call',
     expect(callEdge!.rel.targetId).toContain('mod.py:helper');
   });
 });
+
+// ---------------------------------------------------------------------------
+// Issue #1066 sibling regression for Python: force worker-mode extraction so
+// scope-resolution reparses on cache miss, then assert large ASCII and
+// UTF-8-heavy source files still produce trailing call edges.
+// ---------------------------------------------------------------------------
+
+describe('Python large-file cache-miss parser buffer regression', () => {
+  let repoDir: string;
+  let result: PipelineResult;
+
+  beforeAll(async () => {
+    repoDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gn-python-large-cache-'));
+    writeFixtureRepo(repoDir, {
+      'models.py': `
+class User:
+    def save(self):
+        return True
+`,
+      'ascii_app.py': `from models import User
+
+# ${'x'.repeat(120 * 1024)}
+def create_ascii_user():
+    user = User()
+    user.save()
+`,
+      'utf8_app.py': `from models import User
+
+# ${'漢'.repeat(120_000)}
+def create_utf8_user():
+    user = User()
+    user.save()
+`,
+    });
+    result = await runPipelineFromRepo(repoDir, () => {}, {
+      workerThresholdsForTest: { minFiles: 1, minBytes: 0 },
+    });
+  }, 120000);
+
+  afterAll(() => {
+    if (repoDir !== undefined) fs.rmSync(repoDir, { recursive: true, force: true });
+  });
+
+  it('extracts trailing functions after large ASCII and UTF-8 padding', () => {
+    expect(getNodesByLabel(result, 'Function')).toEqual(
+      expect.arrayContaining(['create_ascii_user', 'create_utf8_user', 'save']),
+    );
+  });
+
+  it('resolves calls from both padded files to User.save', () => {
+    const calls = getRelationships(result, 'CALLS');
+    for (const source of ['create_ascii_user', 'create_utf8_user']) {
+      const save = calls.find((c) => c.source === source && c.target === 'save');
+      expect(save).toBeDefined();
+      expect(save!.targetFilePath).toBe('models.py');
+    }
+  });
+});
diff --git a/gitnexus/test/integration/resolvers/typescript.test.ts b/gitnexus/test/integration/resolvers/typescript.test.ts
index 8714c86b06..e41a077c70 100644
--- a/gitnexus/test/integration/resolvers/typescript.test.ts
+++ b/gitnexus/test/integration/resolvers/typescript.test.ts
@@ -1,8 +1,10 @@
 /**
  * TypeScript: heritage resolution + ambiguous symbol disambiguation
  */
-import { describe, it, expect, beforeAll } from 'vitest';
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
 import path from 'path';
+import fs from 'node:fs';
+import os from 'node:os';
 import {
   FIXTURES,
   getRelationships,
@@ -13,6 +15,14 @@ import {
   type PipelineResult,
 } from './helpers.js';
 
+function writeFixtureRepo(root: string, files: Record<string, string>): void {
+  for (const [relPath, content] of Object.entries(files)) {
+    const fullPath = path.join(root, relPath);
+    fs.mkdirSync(path.dirname(fullPath), { recursive: true });
+    fs.writeFileSync(fullPath, content, 'utf8');
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Heritage: class extends + implements interface
 // ---------------------------------------------------------------------------
@@ -2815,3 +2825,76 @@ describe('TypeScript namespace re-export barrel (registry-primary)', () => {
     expect(fromBarrel).toContain('src/base.ts');
   });
 });
+
+// ---------------------------------------------------------------------------
+// Issue #1066 sibling regression for TypeScript: force worker-mode extraction
+// so scope-resolution reparses on cache miss, then assert large ASCII and
+// UTF-8-heavy source files still produce trailing call edges.
+// ---------------------------------------------------------------------------
+
+describe('TypeScript large-file cache-miss parser buffer regression', () => {
+  let repoDir: string;
+  let result: PipelineResult;
+
+  beforeAll(async () => {
+    repoDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gn-ts-large-cache-'));
+    writeFixtureRepo(repoDir, {
+      'src/models.ts': `
+export class User {
+  save(): boolean {
+    return true;
+  }
+}
+`,
+      'src/ascii-app.ts': `import { User } from './models';
+
+// ${'x'.repeat(120 * 1024)}
+export function createAsciiUser(): void {
+  const user = new User();
+  user.save();
+}
+`,
+      'src/utf8-app.ts': `import { User } from './models';
+
+// ${'漢'.repeat(120_000)}
+export function createUtf8User(): void {
+  const user = new User();
+  user.save();
+}
+`,
+    });
+    result = await runPipelineFromRepo(repoDir, () => {}, {
+      workerThresholdsForTest: { minFiles: 1, minBytes: 0 },
+    });
+  }, 120000);
+
+  afterAll(() => {
+    if (repoDir !== undefined) fs.rmSync(repoDir, { recursive: true, force: true });
+  });
+
+  it('extracts trailing functions after large ASCII and UTF-8 padding', () => {
+    expect(getNodesByLabel(result, 'Function')).toEqual(
+      expect.arrayContaining(['createAsciiUser', 'createUtf8User']),
+    );
+  });
+
+  it('resolves constructor calls from both padded files to User', () => {
+    const calls = getRelationships(result, 'CALLS');
+    for (const source of ['createAsciiUser', 'createUtf8User']) {
+      const ctor = calls.find(
+        (c) => c.source === source && c.target === 'User' && c.targetLabel === 'Class',
+      );
+      expect(ctor).toBeDefined();
+      expect(ctor!.targetFilePath).toBe('src/models.ts');
+    }
+  });
+
+  it('resolves member calls from both padded files to User.save', () => {
+    const calls = getRelationships(result, 'CALLS');
+    for (const source of ['createAsciiUser', 'createUtf8User']) {
+      const save = calls.find((c) => c.source === source && c.target === 'save');
+      expect(save).toBeDefined();
+      expect(save!.targetFilePath).toBe('src/models.ts');
+    }
+  });
+});
diff --git a/gitnexus/test/unit/ingestion-utils.test.ts b/gitnexus/test/unit/ingestion-utils.test.ts
index c41b2e43bd..c75006a960 100644
--- a/gitnexus/test/unit/ingestion-utils.test.ts
+++ b/gitnexus/test/unit/ingestion-utils.test.ts
@@ -6,6 +6,7 @@ import type { NodeLabel } from 'gitnexus-shared';
 import type { LanguageProvider } from '../../src/core/ingestion/language-provider.js';
 import {
   getTreeSitterBufferSize,
+  getTreeSitterContentByteLength,
   TREE_SITTER_BUFFER_SIZE,
   TREE_SITTER_MAX_BUFFER,
 } from '../../src/core/ingestion/constants.js';
@@ -638,56 +639,69 @@ describe('extractFunctionName (via methodExtractor)', () => {
 });
 
 describe('getTreeSitterBufferSize', () => {
+  const expectedBufferSize = (byteLength: number): number =>
+    Math.min(Math.max(byteLength * 2, TREE_SITTER_BUFFER_SIZE), TREE_SITTER_MAX_BUFFER);
+
   it('returns minimum 512KB for small files', () => {
-    expect(getTreeSitterBufferSize(100)).toBe(TREE_SITTER_BUFFER_SIZE);
-    expect(getTreeSitterBufferSize(0)).toBe(TREE_SITTER_BUFFER_SIZE);
-    expect(getTreeSitterBufferSize(1000)).toBe(TREE_SITTER_BUFFER_SIZE);
+    expect(getTreeSitterBufferSize('x'.repeat(100))).toBe(TREE_SITTER_BUFFER_SIZE);
+    expect(getTreeSitterBufferSize('')).toBe(TREE_SITTER_BUFFER_SIZE);
+    expect(getTreeSitterBufferSize('x'.repeat(1000))).toBe(TREE_SITTER_BUFFER_SIZE);
   });
 
   it('returns 2x content length when larger than minimum', () => {
-    const size = 400 * 1024; // 400 KB — 2x = 800 KB > 512 KB min
-    expect(getTreeSitterBufferSize(size)).toBe(size * 2);
+    const size = 400 * 1024; // 400 KB, 2x = 800 KB > 512 KB min
+    expect(getTreeSitterBufferSize('x'.repeat(size))).toBe(size * 2);
   });
 
   it('caps at 32MB for very large files', () => {
-    const huge = 20 * 1024 * 1024; // 20 MB — 2x = 40 MB > 32 MB cap
+    const huge = 'x'.repeat(20 * 1024 * 1024); // 20 MB, 2x = 40 MB > 32 MB cap
     expect(getTreeSitterBufferSize(huge)).toBe(32 * 1024 * 1024);
   });
 
   it('returns exactly 512KB at the boundary', () => {
     // 256KB * 2 = 512KB = minimum, so should return minimum
-    expect(getTreeSitterBufferSize(256 * 1024)).toBe(TREE_SITTER_BUFFER_SIZE);
+    expect(getTreeSitterBufferSize('x'.repeat(256 * 1024))).toBe(TREE_SITTER_BUFFER_SIZE);
   });
 
   it('scales linearly between min and max', () => {
-    const small = getTreeSitterBufferSize(300 * 1024);
-    const medium = getTreeSitterBufferSize(1 * 1024 * 1024);
-    const large = getTreeSitterBufferSize(5 * 1024 * 1024);
+    const small = getTreeSitterBufferSize('x'.repeat(300 * 1024));
+    const medium = getTreeSitterBufferSize('x'.repeat(1 * 1024 * 1024));
+    const large = getTreeSitterBufferSize('x'.repeat(5 * 1024 * 1024));
     expect(small).toBeLessThan(medium);
     expect(medium).toBeLessThan(large);
   });
 
+  it('sizes from UTF-8 bytes, not UTF-16 code units', () => {
+    const source = '漢'.repeat(190_000);
+    const byteLength = getTreeSitterContentByteLength(source);
+    expect(byteLength).toBe(source.length * 3);
+    expect(getTreeSitterBufferSize(source)).toBe(expectedBufferSize(byteLength));
+  });
+
+  it('caps UTF-8-heavy sources using byte length', () => {
+    const source = '漢'.repeat(6_000_000);
+    expect(getTreeSitterContentByteLength(source)).toBe(source.length * 3);
+    expect(getTreeSitterBufferSize(source)).toBe(TREE_SITTER_MAX_BUFFER);
+  });
+
   it('TREE_SITTER_MAX_BUFFER is 32MB', () => {
     expect(TREE_SITTER_MAX_BUFFER).toBe(32 * 1024 * 1024);
   });
 
   it('returns max buffer at exact boundary (16MB input)', () => {
     // 16MB * 2 = 32MB = max
-    expect(getTreeSitterBufferSize(16 * 1024 * 1024)).toBe(TREE_SITTER_MAX_BUFFER);
+    expect(getTreeSitterBufferSize('x'.repeat(16 * 1024 * 1024))).toBe(TREE_SITTER_MAX_BUFFER);
   });
 
   it('file just over max returns max buffer', () => {
     // 17MB * 2 = 34MB > 32MB cap
-    expect(getTreeSitterBufferSize(17 * 1024 * 1024)).toBe(TREE_SITTER_MAX_BUFFER);
+    expect(getTreeSitterBufferSize('x'.repeat(17 * 1024 * 1024))).toBe(TREE_SITTER_MAX_BUFFER);
   });
 
   it('handles files between old 512KB limit and new 32MB limit', () => {
-    // This is the range that was previously silently skipped
     const sizes = [600 * 1024, 1024 * 1024, 5 * 1024 * 1024, 10 * 1024 * 1024];
     for (const size of sizes) {
-      const bufSize = getTreeSitterBufferSize(size);
-      expect(bufSize).toBeGreaterThanOrEqual(TREE_SITTER_BUFFER_SIZE);
-      expect(bufSize).toBeLessThanOrEqual(TREE_SITTER_MAX_BUFFER);
+      expect(getTreeSitterBufferSize('x'.repeat(size))).toBe(expectedBufferSize(size));
     }
   });
 });
diff --git a/gitnexus/test/unit/scope-resolution/csharp/csharp-captures.test.ts b/gitnexus/test/unit/scope-resolution/csharp/csharp-captures.test.ts
index 598d480899..c8111d2036 100644
--- a/gitnexus/test/unit/scope-resolution/csharp/csharp-captures.test.ts
+++ b/gitnexus/test/unit/scope-resolution/csharp/csharp-captures.test.ts
@@ -26,6 +26,26 @@ describe('emitCsharpScopeCaptures — scopes', () => {
     expect(all.some((t) => t.includes('@scope.module'))).toBe(true);
   });
 
+  it('parses large cache-miss files with the adaptive tree-sitter buffer', () => {
+    const padding = 'x'.repeat(600 * 1024);
+    const match = findMatch(
+      `namespace Large;\n// ${padding}\nclass Big { public void AfterPadding() { } }`,
+      (t) => t.includes('@declaration.method'),
+    );
+    expect(match).toBeDefined();
+    expect(match!['@declaration.name'].text).toBe('AfterPadding');
+  });
+
+  it('parses UTF-8-heavy cache-miss files with a byte-sized buffer', () => {
+    const padding = '漢'.repeat(190_000);
+    const match = findMatch(
+      `namespace Large;\n// ${padding}\nclass Big { public void AfterPadding() { } }`,
+      (t) => t.includes('@declaration.method'),
+    );
+    expect(match).toBeDefined();
+    expect(match!['@declaration.name'].text).toBe('AfterPadding');
+  });
+
   it('captures block-scoped namespaces as @scope.namespace', () => {
     const all = tagsFor('namespace Foo.Bar { class A { } }');
     expect(all.some((t) => t.includes('@scope.namespace'))).toBe(true);
diff --git a/gitnexus/test/unit/scope-resolution/csharp/csharp-hooks.test.ts b/gitnexus/test/unit/scope-resolution/csharp/csharp-hooks.test.ts
index 5e37e04d2b..808bce9cfc 100644
--- a/gitnexus/test/unit/scope-resolution/csharp/csharp-hooks.test.ts
+++ b/gitnexus/test/unit/scope-resolution/csharp/csharp-hooks.test.ts
@@ -18,16 +18,20 @@ import {
 } from '../../../../src/core/ingestion/languages/csharp/simple-hooks.js';
 import { csharpMergeBindings } from '../../../../src/core/ingestion/languages/csharp/merge-bindings.js';
 import { csharpArityCompatibility } from '../../../../src/core/ingestion/languages/csharp/arity.js';
+import { populateCsharpNamespaceSiblings } from '../../../../src/core/ingestion/languages/csharp/namespace-siblings.js';
 import type {
   BindingRef,
   Callsite,
   CaptureMatch,
+  ParsedFile,
   ParsedImport,
   Scope,
+  ScopeId,
   ScopeTree,
   SymbolDefinition,
   TypeRef,
 } from 'gitnexus-shared';
+import type { ScopeResolutionIndexes } from '../../../../src/core/ingestion/model/scope-resolution-indexes.js';
 
 function fakeScope(
   kind: Scope['kind'],
@@ -189,6 +193,137 @@ describe('csharpArityCompatibility', () => {
   });
 });
 
+describe('populateCsharpNamespaceSiblings', () => {
+  const classDef = (nodeId: string, filePath: string, qualifiedName: string): SymbolDefinition =>
+    ({ nodeId, filePath, qualifiedName, type: 'Class' }) as SymbolDefinition;
+
+  const scope = (
+    id: string,
+    kind: Scope['kind'],
+    filePath: string,
+    parent: ScopeId | null = null,
+    ownedDefs: readonly SymbolDefinition[] = [],
+  ): Scope =>
+    ({
+      id: id as ScopeId,
+      kind,
+      parent,
+      filePath,
+      range: { startLine: 1, startColumn: 0, endLine: 10, endColumn: 0 },
+      bindings: new Map(),
+      imports: [],
+      ownedDefs,
+      typeBindings: new Map(),
+    }) as unknown as Scope;
+
+  it('writes namespace siblings to the augmentation channel without touching frozen finalized bindings', () => {
+    // Verifies the post-finalize binding-augmentation contract for the
+    // C# namespace-siblings hook (per ScopeResolver I8 + the
+    // `bindingAugmentations` doc on `ScopeResolutionIndexes`):
+    //   * `indexes.bindings` (the finalize output) stays frozen and
+    //     its inner `BindingRef[]` arrays are NEVER mutated by the
+    //     hook — proven here by passing a frozen bucket and asserting
+    //     it survives unchanged.
+    //   * Cross-file siblings are appended to
+    //     `indexes.bindingAugmentations`, the dedicated mutable
+    //     append-only buffer.
+    //   * Walkers downstream (`lookupBindingsAt`) merge the two layers
+    //     transparently — covered by walkers-augmentations.test.ts.
+    // Reproduces the pre-architecture `Cannot add property N, object
+    // is not extensible` crash by carrying a pre-frozen `BindingRef[]`
+    // through `indexes.bindings`. End-to-end coverage is in the
+    // `csharp-large-cache-miss-resolution` fixture.
+    const existing = classDef('def:external.B', 'external.cs', 'Other.B');
+    const sibling = classDef('def:b.B', 'b.cs', 'Demo.B');
+    const moduleA = scope('scope:a:module', 'Module', 'a.cs');
+    const moduleB = scope('scope:b:module', 'Module', 'b.cs');
+    const classB = scope('scope:b:class', 'Class', 'b.cs', moduleB.id, [sibling]);
+    const parsedFiles: ParsedFile[] = [
+      {
+        filePath: 'a.cs',
+        moduleScope: moduleA.id,
+        scopes: Object.freeze([moduleA]),
+        parsedImports: Object.freeze([]),
+        localDefs: Object.freeze([]),
+        referenceSites: Object.freeze([]),
+      } as ParsedFile,
+      {
+        filePath: 'b.cs',
+        moduleScope: moduleB.id,
+        scopes: Object.freeze([moduleB, classB]),
+        parsedImports: Object.freeze([]),
+        localDefs: Object.freeze([sibling]),
+        referenceSites: Object.freeze([]),
+      } as ParsedFile,
+    ];
+    const frozenBucket = Object.freeze([{ def: existing, origin: 'import' } as BindingRef]);
+    const bindings = new Map<ScopeId, ReadonlyMap<string, readonly BindingRef[]>>([
+      [moduleA.id, new Map<string, readonly BindingRef[]>([['B', frozenBucket]])],
+    ]);
+    const bindingAugmentations = new Map<ScopeId, ReadonlyMap<string, readonly BindingRef[]>>();
+
+    populateCsharpNamespaceSiblings(
+      parsedFiles,
+      { bindings, bindingAugmentations } as unknown as ScopeResolutionIndexes,
+      {
+        fileContents: new Map([
+          ['a.cs', 'namespace Demo;\nclass A { }\n'],
+          ['b.cs', 'namespace Demo;\nclass B { }\n'],
+        ]),
+      },
+    );
+
+    const finalized = bindings.get(moduleA.id)?.get('B') ?? [];
+    expect(finalized).toBe(frozenBucket);
+    expect(finalized.map((b) => b.def.nodeId)).toEqual(['def:external.B']);
+    expect(Object.isFrozen(finalized)).toBe(true);
+
+    const augmented = bindingAugmentations.get(moduleA.id)?.get('B') ?? [];
+    expect(augmented.map((b) => b.def.nodeId)).toEqual(['def:b.B']);
+    expect(Object.isFrozen(augmented)).toBe(false);
+  });
+
+  it('parses UTF-8-heavy cache-miss files before namespace sibling injection', () => {
+    const sibling = classDef('def:b.B', 'b.cs', 'Demo.B');
+    const moduleA = scope('scope:a:module', 'Module', 'a.cs');
+    const moduleB = scope('scope:b:module', 'Module', 'b.cs');
+    const classB = scope('scope:b:class', 'Class', 'b.cs', moduleB.id, [sibling]);
+    const parsedFiles: ParsedFile[] = [
+      {
+        filePath: 'a.cs',
+        moduleScope: moduleA.id,
+        scopes: Object.freeze([moduleA]),
+        parsedImports: Object.freeze([]),
+        localDefs: Object.freeze([]),
+        referenceSites: Object.freeze([]),
+      } as ParsedFile,
+      {
+        filePath: 'b.cs',
+        moduleScope: moduleB.id,
+        scopes: Object.freeze([moduleB, classB]),
+        parsedImports: Object.freeze([]),
+        localDefs: Object.freeze([sibling]),
+        referenceSites: Object.freeze([]),
+      } as ParsedFile,
+    ];
+    const bindingAugmentations = new Map<ScopeId, ReadonlyMap<string, readonly BindingRef[]>>();
+    const padding = '漢'.repeat(190_000);
+
+    populateCsharpNamespaceSiblings(
+      parsedFiles,
+      { bindings: new Map(), bindingAugmentations } as unknown as ScopeResolutionIndexes,
+      {
+        fileContents: new Map([
+          ['a.cs', `namespace Demo;\n// ${padding}\nclass A { }\n`],
+          ['b.cs', `namespace Demo;\n// ${padding}\nclass B { }\n`],
+        ]),
+      },
+    );
+
+    expect(bindingAugmentations.get(moduleA.id)?.get('B')?.[0]?.def.nodeId).toBe('def:b.B');
+  });
+});
+
 describe('csharpReceiverBinding', () => {
   it('returns the `this` type binding for an instance method scope', () => {
     const binding: TypeRef = { rawName: 'User', source: 'self' } as unknown as TypeRef;
diff --git a/gitnexus/test/unit/scope-resolution/imported-return-types.test.ts b/gitnexus/test/unit/scope-resolution/imported-return-types.test.ts
index 7512d7e084..078588f867 100644
--- a/gitnexus/test/unit/scope-resolution/imported-return-types.test.ts
+++ b/gitnexus/test/unit/scope-resolution/imported-return-types.test.ts
@@ -30,7 +30,16 @@ import { typescriptScopeResolver } from '../../../src/core/ingestion/languages/t
 import { finalizeScopeModel } from '../../../src/core/ingestion/finalize-orchestrator.js';
 import { buildWorkspaceResolutionIndex } from '../../../src/core/ingestion/scope-resolution/workspace-index.js';
 import { propagateImportedReturnTypes } from '../../../src/core/ingestion/scope-resolution/passes/imported-return-types.js';
-import type { ParsedFile } from 'gitnexus-shared';
+import type {
+  BindingRef,
+  ParsedFile,
+  Scope,
+  ScopeId,
+  ScopeTree,
+  SymbolDefinition,
+} from 'gitnexus-shared';
+import type { ScopeResolutionIndexes } from '../../../src/core/ingestion/model/scope-resolution-indexes.js';
+import type { WorkspaceResolutionIndex } from '../../../src/core/ingestion/scope-resolution/workspace-index.js';
 
 interface InMemoryFile {
   readonly path: string;
@@ -197,6 +206,61 @@ import { helper } from './service';
     }
   });
 
+  it('mirrors import return types from bindingAugmentations-only refs', () => {
+    const appScopeId = 'scope:app' as ScopeId;
+    const sourceScopeId = 'scope:source' as ScopeId;
+    const appModule = {
+      id: appScopeId,
+      kind: 'Module',
+      parent: null,
+      filePath: 'app.ts',
+      bindings: new Map(),
+      typeBindings: new Map(),
+    } as unknown as Scope;
+    const sourceModule = {
+      id: sourceScopeId,
+      kind: 'Module',
+      parent: null,
+      filePath: 'source.ts',
+      bindings: new Map(),
+      typeBindings: new Map([['getUser', { rawName: 'User', source: 'return-annotation' }]]),
+    } as unknown as Scope;
+    const importedDef = {
+      nodeId: 'def:source.getUser',
+      filePath: 'source.ts',
+      qualifiedName: 'getUser',
+      type: 'Function',
+    } as SymbolDefinition;
+    const scopeTree = {
+      getScope: (id: ScopeId) => {
+        if (id === appScopeId) return appModule;
+        if (id === sourceScopeId) return sourceModule;
+        return undefined;
+      },
+    } as unknown as ScopeTree;
+    const indexes = {
+      scopeTree,
+      bindings: new Map(),
+      bindingAugmentations: new Map([
+        [
+          appScopeId,
+          new Map([['getUser', [{ def: importedDef, origin: 'import' } as BindingRef]]]),
+        ],
+      ]),
+      sccs: [{ files: ['app.ts'] }],
+    } as unknown as ScopeResolutionIndexes;
+    const workspaceIndex = {
+      moduleScopeByFile: new Map([
+        ['app.ts', appModule],
+        ['source.ts', sourceModule],
+      ]),
+    } as unknown as WorkspaceResolutionIndex;
+
+    propagateImportedReturnTypes([], indexes, workspaceIndex);
+
+    expect(appModule.typeBindings.get('getUser')?.rawName).toBe('User');
+  });
+
   it('does not throw on a cyclic SCC (partial fixpoint, best-effort)', () => {
     // a.ts imports from b, b.ts imports from a. The two files form
     // a single cyclic SCC. Within one pass we mirror what we can;
diff --git a/gitnexus/test/unit/scope-resolution/python/python-fixtures.test.ts b/gitnexus/test/unit/scope-resolution/python/python-fixtures.test.ts
index bffc709cd9..06bf982803 100644
--- a/gitnexus/test/unit/scope-resolution/python/python-fixtures.test.ts
+++ b/gitnexus/test/unit/scope-resolution/python/python-fixtures.test.ts
@@ -65,6 +65,20 @@ describe('Python scopes — module / class / function', () => {
     expect(f.scopes[0]!.kind).toBe('Module');
   });
 
+  it('case 01b: large cache-miss files use the adaptive tree-sitter buffer', () => {
+    const padding = 'x'.repeat(600 * 1024);
+    const f = parse(`# ${padding}\ndef after_padding():\n    return 1\n`);
+    expect(scopesByKind(f, 'Module')).toHaveLength(1);
+    expect(findDef(f, 'after_padding')?.type).toBe('Function');
+  });
+
+  it('case 01c: UTF-8-heavy cache-miss files use byte-sized parser buffers', () => {
+    const padding = '漢'.repeat(190_000);
+    const f = parse(`# ${padding}\ndef after_padding():\n    return 1\n`);
+    expect(scopesByKind(f, 'Module')).toHaveLength(1);
+    expect(findDef(f, 'after_padding')?.type).toBe('Function');
+  });
+
   it('case 02: module-level assignment produces a Variable declaration in Module scope', () => {
     const f = parse('x = 1\n');
     expect(scopesByKind(f, 'Module')).toHaveLength(1);
diff --git a/gitnexus/test/unit/scope-resolution/typescript/typescript-captures.test.ts b/gitnexus/test/unit/scope-resolution/typescript/typescript-captures.test.ts
index de084e6574..8d465ab823 100644
--- a/gitnexus/test/unit/scope-resolution/typescript/typescript-captures.test.ts
+++ b/gitnexus/test/unit/scope-resolution/typescript/typescript-captures.test.ts
@@ -37,6 +37,24 @@ describe('emitTsScopeCaptures — scopes', () => {
     expect(all.some((t) => t.includes('@scope.module'))).toBe(true);
   });
 
+  it('parses large cache-miss files with the adaptive tree-sitter buffer', () => {
+    const padding = 'x'.repeat(600 * 1024);
+    const match = findMatch(`// ${padding}\nclass Big { afterPadding(): void {} }`, (t) =>
+      t.includes('@declaration.method'),
+    );
+    expect(match).toBeDefined();
+    expect(match!['@declaration.name'].text).toBe('afterPadding');
+  });
+
+  it('parses UTF-8-heavy cache-miss files with a byte-sized buffer', () => {
+    const padding = '漢'.repeat(190_000);
+    const match = findMatch(`// ${padding}\nclass Big { afterPadding(): void {} }`, (t) =>
+      t.includes('@declaration.method'),
+    );
+    expect(match).toBeDefined();
+    expect(match!['@declaration.name'].text).toBe('afterPadding');
+  });
+
   it('captures internal_module as @scope.namespace', () => {
     const all = tagsFor('namespace Foo { class A { } }');
     expect(all.some((t) => t.includes('@scope.namespace'))).toBe(true);
diff --git a/gitnexus/test/unit/scope-resolution/validate-bindings-immutability.test.ts b/gitnexus/test/unit/scope-resolution/validate-bindings-immutability.test.ts
new file mode 100644
index 0000000000..bcf23200c8
--- /dev/null
+++ b/gitnexus/test/unit/scope-resolution/validate-bindings-immutability.test.ts
@@ -0,0 +1,177 @@
+/**
+ * Unit tests for the dev-mode I8 binding-immutability validator.
+ *
+ * Mirrors `validateOwnershipParity` (#909) — happy path + drift
+ * detection + opt-in runtime gating. Pinning these so a
+ * future contributor can't silently re-introduce the issue #1066
+ * shape (a hook mutating `indexes.bindings` instead of
+ * `indexes.bindingAugmentations`) without tripping the validator.
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import type { BindingRef, ScopeId } from 'gitnexus-shared';
+import type { ScopeResolutionIndexes } from '../../../src/core/ingestion/model/scope-resolution-indexes.js';
+import { validateBindingsImmutability } from '../../../src/core/ingestion/scope-resolution/pipeline/validate-bindings-immutability.js';
+
+const mkRef = (nodeId: string): BindingRef =>
+  ({
+    def: { nodeId, filePath: 'x.ts', type: 'Class' },
+    origin: 'local',
+  }) as unknown as BindingRef;
+
+const mkIndexes = (
+  bindings: Map<ScopeId, Map<string, readonly BindingRef[]>>,
+  augmentations: Map<ScopeId, Map<string, BindingRef[]>>,
+): ScopeResolutionIndexes =>
+  ({
+    bindings,
+    bindingAugmentations: augmentations,
+  }) as unknown as ScopeResolutionIndexes;
+
+describe('validateBindingsImmutability', () => {
+  beforeEach(() => {
+    // Insulate against an ambient VALIDATE_SEMANTIC_MODEL in a developer's
+    // shell. Per-test env tweaks override this baseline as needed.
+    vi.stubEnv('VALIDATE_SEMANTIC_MODEL', undefined);
+  });
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it('is silent when finalized buckets are frozen and augmentation buckets are mutable', () => {
+    vi.stubEnv('NODE_ENV', 'development');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', Object.freeze([mkRef('def:Foo')])]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>([
+      ['scope:a:module', new Map([['Bar', [mkRef('def:Bar')]]])],
+    ]);
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(0);
+    expect(onWarn).not.toHaveBeenCalled();
+  });
+
+  it('warns when a bucket in indexes.bindings is NOT frozen', () => {
+    vi.stubEnv('NODE_ENV', 'development');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', [mkRef('def:Foo')] as readonly BindingRef[]]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(1);
+    expect(onWarn).toHaveBeenCalledTimes(1);
+    expect(onWarn.mock.calls[0][0]).toMatch(/binding-immutability/);
+    expect(onWarn.mock.calls[0][0]).toMatch(/indexes\.bindings/);
+    expect(onWarn.mock.calls[0][0]).toMatch(/I8/);
+  });
+
+  it('warns when a bucket in indexes.bindingAugmentations IS frozen', () => {
+    vi.stubEnv('NODE_ENV', 'development');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>();
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>([
+      ['scope:a:module', new Map([['Bar', Object.freeze([mkRef('def:Bar')]) as BindingRef[]]])],
+    ]);
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(1);
+    expect(onWarn).toHaveBeenCalledTimes(1);
+    expect(onWarn.mock.calls[0][0]).toMatch(/binding-immutability/);
+    expect(onWarn.mock.calls[0][0]).toMatch(/indexes\.bindingAugmentations/);
+    expect(onWarn.mock.calls[0][0]).toMatch(/I8/);
+  });
+
+  it('does not detect semantically wrong frozen replacements in indexes.bindings', () => {
+    vi.stubEnv('NODE_ENV', 'development');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', Object.freeze([mkRef('def:Wrong')])]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(0);
+    expect(onWarn).not.toHaveBeenCalled();
+  });
+
+  it('counts violations across multiple scopes', () => {
+    vi.stubEnv('NODE_ENV', 'development');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', [mkRef('def:Foo')] as readonly BindingRef[]]])],
+      ['scope:b:module', new Map([['Bar', [mkRef('def:Bar')] as readonly BindingRef[]]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(2);
+    expect(onWarn).toHaveBeenCalledTimes(2);
+  });
+
+  it('is a no-op when NODE_ENV=production', () => {
+    vi.stubEnv('NODE_ENV', 'production');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', [mkRef('def:Foo')] as readonly BindingRef[]]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(0);
+    expect(onWarn).not.toHaveBeenCalled();
+  });
+
+  it('is a no-op in default CLI env when NODE_ENV is unset', () => {
+    vi.stubEnv('NODE_ENV', undefined);
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', [mkRef('def:Foo')] as readonly BindingRef[]]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(0);
+    expect(onWarn).not.toHaveBeenCalled();
+  });
+
+  it('runs when VALIDATE_SEMANTIC_MODEL=1 even if NODE_ENV is unset', () => {
+    vi.stubEnv('NODE_ENV', undefined);
+    vi.stubEnv('VALIDATE_SEMANTIC_MODEL', '1');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', [mkRef('def:Foo')] as readonly BindingRef[]]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(1);
+    expect(onWarn).toHaveBeenCalledTimes(1);
+  });
+
+  it('is a no-op when VALIDATE_SEMANTIC_MODEL=0', () => {
+    vi.stubEnv('NODE_ENV', 'development');
+    vi.stubEnv('VALIDATE_SEMANTIC_MODEL', '0');
+    const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>([
+      ['scope:a:module', new Map([['Foo', [mkRef('def:Foo')] as readonly BindingRef[]]])],
+    ]);
+    const augmentations = new Map<ScopeId, Map<string, BindingRef[]>>();
+    const onWarn = vi.fn();
+
+    const violations = validateBindingsImmutability(mkIndexes(bindings, augmentations), onWarn);
+
+    expect(violations).toBe(0);
+    expect(onWarn).not.toHaveBeenCalled();
+  });
+});
diff --git a/gitnexus/test/unit/scope-resolution/walkers-augmentations.test.ts b/gitnexus/test/unit/scope-resolution/walkers-augmentations.test.ts
new file mode 100644
index 0000000000..d83e1fa367
--- /dev/null
+++ b/gitnexus/test/unit/scope-resolution/walkers-augmentations.test.ts
@@ -0,0 +1,195 @@
+/**
+ * Unit coverage for `lookupBindingsAt` — the dual-source binding
+ * lookup primitive used by every walker that needs cross-file
+ * visibility (Step 2 of the binding-augmentation-channel refactor).
+ *
+ * These tests pin the contract exhaustively: precedence (finalized
+ * first), dedup (by `def.nodeId`), empty-array semantics, and the
+ * shared-empty-frozen-array identity for misses. Every other walker
+ * test in this directory delegates to `lookupBindingsAt` after the
+ * refactor, so a regression here surfaces quickly.
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  findCallableBindingInScope,
+  findClassBindingInScope,
+  findExportedDefByName,
+  lookupBindingsAt,
+} from '../../../src/core/ingestion/scope-resolution/scope/walkers.js';
+import type { BindingRef, Scope, ScopeId, ScopeTree, SymbolDefinition } from 'gitnexus-shared';
+import type { ScopeResolutionIndexes } from '../../../src/core/ingestion/model/scope-resolution-indexes.js';
+import type { WorkspaceResolutionIndex } from '../../../src/core/ingestion/scope-resolution/workspace-index.js';
+
+const SCOPE = 'scope:m' as ScopeId;
+
+const def = (nodeId: string): SymbolDefinition =>
+  ({ nodeId, filePath: 'm.ts', type: 'Function' }) as SymbolDefinition;
+
+const ref = (nodeId: string, origin: BindingRef['origin'] = 'local'): BindingRef =>
+  ({ def: def(nodeId), origin }) as BindingRef;
+
+function indexesWith({
+  finalized,
+  augmented,
+}: {
+  finalized?: readonly BindingRef[];
+  augmented?: readonly BindingRef[];
+}): ScopeResolutionIndexes {
+  const bindings = new Map<ScopeId, Map<string, readonly BindingRef[]>>();
+  if (finalized !== undefined) {
+    Object.freeze(finalized as BindingRef[]);
+    bindings.set(SCOPE, new Map([['name', finalized]]));
+  }
+  const bindingAugmentations = new Map<ScopeId, Map<string, readonly BindingRef[]>>();
+  if (augmented !== undefined) bindingAugmentations.set(SCOPE, new Map([['name', augmented]]));
+  return { bindings, bindingAugmentations } as unknown as ScopeResolutionIndexes;
+}
+
+function scope(id: ScopeId, bindings = new Map<string, readonly BindingRef[]>()): Scope {
+  return {
+    id,
+    kind: 'Module',
+    parent: null,
+    filePath: 'm.ts',
+    range: { startLine: 1, startColumn: 0, endLine: 1, endColumn: 0 },
+    bindings,
+    imports: [],
+    ownedDefs: [],
+    typeBindings: new Map(),
+  } as unknown as Scope;
+}
+
+function indexesForScopeLookup(
+  moduleScope: Scope,
+  augmented: Map<string, readonly BindingRef[]>,
+): ScopeResolutionIndexes {
+  const scopeTree = {
+    getScope: (id: ScopeId) => (id === moduleScope.id ? moduleScope : undefined),
+  } as unknown as ScopeTree;
+  return {
+    scopeTree,
+    bindings: new Map(),
+    bindingAugmentations: new Map([[moduleScope.id, augmented]]),
+  } as unknown as ScopeResolutionIndexes;
+}
+
+describe('lookupBindingsAt', () => {
+  it('returns the finalized bucket when augmentations are absent', () => {
+    const finalized = [ref('A'), ref('B')];
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ finalized }));
+    expect(out).toEqual(finalized);
+    // Identity preserved when only one channel populates — no allocation.
+    expect(out).toBe(finalized);
+  });
+
+  it('returns the augmented bucket when finalized is absent', () => {
+    const augmented = [ref('X', 'namespace')];
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ augmented }));
+    expect(out).toEqual(augmented);
+    expect(out).toBe(augmented);
+  });
+
+  it('concatenates with finalized first when both populate disjoint nodeIds', () => {
+    const finalized = [ref('A', 'import'), ref('B', 'import')];
+    const augmented = [ref('C', 'namespace'), ref('D', 'namespace')];
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ finalized, augmented }));
+    expect(out.map((b) => b.def.nodeId)).toEqual(['A', 'B', 'C', 'D']);
+  });
+
+  it('dedupes augmented entries that share a nodeId with finalized (finalized wins)', () => {
+    const finalized = [ref('A', 'import'), ref('B', 'import')];
+    const augmented = [ref('A', 'namespace'), ref('C', 'namespace')];
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ finalized, augmented }));
+    expect(out.map((b) => b.def.nodeId)).toEqual(['A', 'B', 'C']);
+    expect(out.find((b) => b.def.nodeId === 'A')!.origin).toBe('import');
+  });
+
+  it('keeps finalized metadata when the same nodeId appears in both channels', () => {
+    const finalizedDef = {
+      nodeId: 'A',
+      filePath: 'finalized.ts',
+      qualifiedName: 'finalized.A',
+      type: 'Function',
+    } as SymbolDefinition;
+    const augmentedDef = {
+      nodeId: 'A',
+      filePath: 'augmented.ts',
+      qualifiedName: 'augmented.A',
+      type: 'Method',
+    } as SymbolDefinition;
+    const out = lookupBindingsAt(
+      SCOPE,
+      'name',
+      indexesWith({
+        finalized: [{ def: finalizedDef, origin: 'import' } as BindingRef],
+        augmented: [{ def: augmentedDef, origin: 'namespace' } as BindingRef],
+      }),
+    );
+    expect(out).toHaveLength(1);
+    expect(out[0]!.def.filePath).toBe('finalized.ts');
+    expect(out[0]!.def.qualifiedName).toBe('finalized.A');
+    expect(out[0]!.origin).toBe('import');
+  });
+
+  it('returns the shared empty array on a miss in both channels', () => {
+    const a = lookupBindingsAt(SCOPE, 'name', indexesWith({}));
+    const b = lookupBindingsAt(SCOPE, 'other', indexesWith({}));
+    expect(a).toEqual([]);
+    expect(b).toEqual([]);
+    expect(a).toBe(b);
+    expect(Object.isFrozen(a)).toBe(true);
+  });
+
+  it('treats an empty finalized bucket as absent (returns augmented)', () => {
+    const augmented = [ref('Z', 'namespace')];
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ finalized: [], augmented }));
+    expect(out).toBe(augmented);
+  });
+
+  it('treats an empty augmented bucket as absent (returns finalized)', () => {
+    const finalized = [ref('Z', 'import')];
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ finalized, augmented: [] }));
+    expect(out).toBe(finalized);
+  });
+
+  it('returns the shared empty array when both buckets exist but are empty', () => {
+    const out = lookupBindingsAt(SCOPE, 'name', indexesWith({ finalized: [], augmented: [] }));
+    expect(out).toEqual([]);
+    expect(Object.isFrozen(out)).toBe(true);
+  });
+});
+
+describe('walker helpers read bindingAugmentations', () => {
+  it('findClassBindingInScope finds class-like refs that exist only in augmentations', () => {
+    const moduleScope = scope(SCOPE);
+    const classRef = {
+      def: { ...def('ClassA'), type: 'Class' },
+      origin: 'namespace',
+    } as BindingRef;
+    const indexes = indexesForScopeLookup(moduleScope, new Map([['ClassA', [classRef]]]));
+
+    expect(findClassBindingInScope(SCOPE, 'ClassA', indexes)?.nodeId).toBe('ClassA');
+  });
+
+  it('findCallableBindingInScope finds callable refs that exist only in augmentations', () => {
+    const moduleScope = scope(SCOPE);
+    const callableRef = { def: def('callMe'), origin: 'import' } as BindingRef;
+    const indexes = indexesForScopeLookup(moduleScope, new Map([['callMe', [callableRef]]]));
+
+    expect(findCallableBindingInScope(SCOPE, 'callMe', indexes)?.nodeId).toBe('callMe');
+  });
+
+  it('findExportedDefByName finds callable refs that exist only in augmentations', () => {
+    const moduleScope = scope(SCOPE);
+    const callableRef = { def: def('fromAugmentation'), origin: 'import' } as BindingRef;
+    const indexes = indexesForScopeLookup(moduleScope, new Map([['run', [callableRef]]]));
+    const workspaceIndex = {
+      moduleScopeByFile: new Map(),
+    } as unknown as WorkspaceResolutionIndex;
+
+    expect(findExportedDefByName('run', SCOPE, indexes, workspaceIndex)?.nodeId).toBe(
+      'fromAugmentation',
+    );
+  });
+});