diff --git a/packages/cli/src/__tests__/pi-transcript.test.ts b/packages/cli/src/__tests__/pi-transcript.test.ts
index 1f2a04efe0..06f7152ba6 100644
--- a/packages/cli/src/__tests__/pi-transcript.test.ts
+++ b/packages/cli/src/__tests__/pi-transcript.test.ts
@@ -1,6 +1,7 @@
 import assert from 'node:assert/strict';
-import { describe, test } from 'node:test';
+import { before, describe, test } from 'node:test';
 import { visibleWidth } from '@earendil-works/pi-tui';
+import { _setColorLevelForTesting } from '../tui-ansi.js';
 import type { PipeShellOutput, PtyShellOutput, ShellRunToolResult } from '@maka/core';
 import type { SessionEvent, ToolResultContent } from '@maka/core/events';
 import type { StoredMessage } from '@maka/core/session';
@@ -22,6 +23,13 @@ import {
   togglePendingPermissionDetails,
 } from '../pi-transcript.js';
 
+// Pin the color level so ANSI-escape assertions are hermetic. Detection reads
+// process.env.TERM/COLORTERM at module load, so ambient terminal capability
+// (truecolor locally, unset/dumb on CI runners) would otherwise decide whether
+// color escapes appear. Level 3 (truecolor) is the development default these
+// tests lock (#1064/#1066); matches tui-ansi.test.ts's reset convention.
+before(() => _setColorLevelForTesting(3));
+
 describe('Maka Pi TUI transcript', () => {
   test('greets on a fresh empty session and drops the welcome once a prompt lands', () => {
     const state = createMakaPiTranscriptState();
diff --git a/packages/cli/src/__tests__/pi-tui-runner.test.ts b/packages/cli/src/__tests__/pi-tui-runner.test.ts
index f3a27906e8..9516ea05ac 100644
--- a/packages/cli/src/__tests__/pi-tui-runner.test.ts
+++ b/packages/cli/src/__tests__/pi-tui-runner.test.ts
@@ -2,7 +2,7 @@ import assert from 'node:assert/strict';
 import { spawn } from 'node:child_process';
 import { once } from 'node:events';
 import { setTimeout as delay } from 'node:timers/promises';
-import { describe, test } from 'node:test';
+import { before, describe, test } from 'node:test';
 import { visibleWidth } from '@earendil-works/pi-tui';
 import {
   SHELL_RUN_UPDATE_BUFFER_MAX_ENTRIES,
@@ -23,6 +23,7 @@ import type {
   SessionResumeAvailability,
 } from '../session-driver.js';
 import { runMakaPiTui } from '../pi-tui-runner.js';
+import { _setColorLevelForTesting } from '../tui-ansi.js';
 import { BUSY_SPINNER_FRAMES } from '../tui-attention.js';
 import { arrangeAutocompleteAboveEditor } from '../tui-autocomplete-layout.js';
 import {
@@ -34,6 +35,11 @@ import {
   waitFor,
 } from './tui-terminal-mock.js';
 
+// Pin truecolor so the accent-chrome escape assertion ("uses logo blue") is
+// hermetic. Color level is detected from process.env.TERM/COLORTERM at module
+// load, which varies between local (truecolor) and CI (unset/dumb) terminals.
+before(() => _setColorLevelForTesting(3));
+
 describe('Maka Pi TUI runner', () => {
   test('restores the terminal before exiting on SIGTERM', async () => {
     const { code, signal, stdout } = await runSignalExitProbe('SIGTERM');
diff --git a/packages/runtime/src/ai-sdk-backend.ts b/packages/runtime/src/ai-sdk-backend.ts
index 4b61b88e58..b059eb375e 100644
--- a/packages/runtime/src/ai-sdk-backend.ts
+++ b/packages/runtime/src/ai-sdk-backend.ts
@@ -316,13 +316,23 @@ function activeToolResultArchiveKey(
 /**
  * Tool results from the newest completed step have not crossed the provider
  * boundary yet: prepareStep is invoked immediately before the first request
- * that could show those results to the model. Active pruning may archive only
- * calls from older completed steps, after the model has had one request in
- * which to consume their exact output.
+ * that could show those results to the model. By default active pruning defers
+ * the newest step and archives only older completed steps, after the model has
+ * had one request in which to consume their exact output.
+ *
+ * `includeNewestStep` widens eligibility to every completed step, including the
+ * newest. The caller sets it when mid-turn capacity compaction is active: the
+ * final-payload verdict may need an oversized newest result pruned to a
+ * placeholder before declaring exhaustion, and capacity/recovery rebuilds
+ * re-materialize raw bodies from the ledger that must be re-archived.
  */
-function collectPrunablePrepareStepToolCallIds(steps: PrepareStepLike['steps']): Set<string> {
+function collectPrunablePrepareStepToolCallIds(
+  steps: PrepareStepLike['steps'],
+  includeNewestStep: boolean,
+): Set<string> {
   const out = new Set<string>();
-  for (const step of steps.slice(0, -1)) {
+  const prunableSteps = includeNewestStep ? steps : steps.slice(0, -1);
+  for (const step of prunableSteps) {
     for (const call of step.toolCalls ?? []) {
       if (typeof call.toolCallId === 'string' && call.toolCallId.length > 0) {
         out.add(call.toolCallId);
@@ -1447,12 +1457,19 @@ export class AiSdkBackend implements AgentBackend {
           midTurnSystemPromptChars,
           onMidTurnDiagnosticPatch,
         );
-        const activeToolResultPruneHook = this.buildActiveToolResultPrunePrepareStep(turnId, (patch) => {
-          activeToolResultPruneDiagnosticPatch = mergeActiveToolResultPruneDiagnosticPatches(
-            activeToolResultPruneDiagnosticPatch,
-            patch,
-          );
-        });
+        // When mid-turn capacity compaction is active, the prune must also cover
+        // the newest completed step; see collectPrunablePrepareStepToolCallIds.
+        const activeToolResultPruneIncludesNewestStep = midTurnState !== undefined;
+        const activeToolResultPruneHook = this.buildActiveToolResultPrunePrepareStep(
+          turnId,
+          activeToolResultPruneIncludesNewestStep,
+          (patch) => {
+            activeToolResultPruneDiagnosticPatch = mergeActiveToolResultPruneDiagnosticPatches(
+              activeToolResultPruneDiagnosticPatch,
+              patch,
+            );
+          },
+        );
         const shapedPrepareStep = composePrepareStep(
           plan.prepareStep,
           midTurnCapacityHook,
@@ -2408,6 +2425,7 @@ export class AiSdkBackend implements AgentBackend {
 
   private buildActiveToolResultPrunePrepareStep(
     turnId: string,
+    includeNewestStep: boolean,
     onDiagnosticPatch?: (patch: ActiveToolResultPruneDiagnosticPatch) => void,
   ): PrepareStepFunctionLike | undefined {
     const policy = this.input.contextBudget?.activeToolResultPrune;
@@ -2415,7 +2433,7 @@ export class AiSdkBackend implements AgentBackend {
 
     const archivedPlaceholders = new Map<string, ActiveArchivedToolResultPlaceholder>();
     return async (options) => {
-      const eligibleToolCallIds = collectPrunablePrepareStepToolCallIds(options.steps);
+      const eligibleToolCallIds = collectPrunablePrepareStepToolCallIds(options.steps, includeNewestStep);
       if (eligibleToolCallIds.size === 0) return undefined;
       const rewritten = await rewriteActiveToolResultsInMessages({
         messages: options.messages,