fix(memory): scan uncapped when selecting forget candidates

docs/design/2026-08-08-native-memory-recall-reliability.md

@@ -269,3 +269,8 @@ flatters every design; the floor is what makes the headline readable.
 - Recall can see older documents outside the shared 200-document scanner cap,
   but non-recall callers, including Forget, keep the existing capped scanner.
   A broader manageability pass is separate from this recall-only change.
+  Superseded for Forget: issue #9378 moved Forget to the uncapped scanner, with
+  a per-scope bound on the model-selection prompt so literal matches in each
+  scope reach the model first; any match, literal or semantic, ranked past that
+  bound is not offered to the model and can still be missed. Indexer, Status,
+  and Extraction remain capped.

docs/design/2026-08-09-bounded-memory-recall-candidates.md

@@ -83,7 +83,12 @@ is kept.
 
 Forget, Indexer, Status, and Extraction keep the capped scanner. That preserves
 their current behavior but means an older document can become recallable before
-it becomes manageable by those non-recall flows.
+it becomes manageable by those non-recall flows. Superseded for Forget: issue
+#9378 moved Forget to the uncapped scanner, with its own per-scope bound on the
+model-selection prompt: each scope keeps a 200-candidate quota, unused quota is
+redistributed, and literal query matches rank first within a scope. Entries past
+that bound are not offered to the model. Indexer, Status, and Extraction remain
+capped.
 
 ## Failure and compatibility boundaries
 

packages/core/src/memory/extractionAgentPlanner.ts

@@ -105,6 +105,10 @@ function truncate(text: string, maxChars: number): string {
 }
 
 async function buildTopicSummaryBlock(projectRoot: string): Promise<string> {
+  // Deliberately capped, unlike recall (recall.ts) and forget (forget.ts):
+  // every doc is rendered into the extraction agent's task prompt below, so
+  // an uncapped scan would grow that prompt without bound. Anything past the
+  // cap stays reachable — the agent holds read_file/grep/glob/ls.
   // User-level scan is best-effort: a read failure on `~/.qwen/memories/`
   // must not deny the extraction agent its view of existing project-level
   // memories (which it uses to avoid creating duplicates).