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.pi/reviews/context-manager-task3-fix-report.md

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+# Context Manager Task 3 Fix Report
+
+## Status
+- Done
+- Fixed the Task 3 review findings in the extractor and strengthened coverage around extractor/ledger interaction.
+
+## Changes
+1. **Stopped cross-slice subject collisions in extracted memory**
+   - Updated `.pi/agent/extensions/context-manager/src/extract.ts` so synthetic subjects for decisions, constraints, and active tasks include the source `entryId` (for example `decision-u1-0`).
+   - This keeps independently extracted facts from different transcript slices in separate ledger slots without changing public APIs or the ledger merge contract.
+
+2. **Refined user-constraint scoping**
+   - Added a small `inferConstraintScope()` heuristic.
+   - User constraints now default to `branch` scope unless they include durable session-wide signals.
+   - Branch-local cues such as `this branch`, `for now`, `in this file`, or explicit file references stay branch-scoped.
+   - Durable cues such as `whole session`, `across branches`, `MVP`, or `context window` stay session-scoped.
+
+3. **Strengthened regression coverage**
+   - Expanded `.pi/agent/extensions/context-manager/src/extract.test.ts` to verify source metadata, stable per-slice subject generation, extractor/ledger interaction, and the refined scope heuristic.
+   - Added regression coverage proving independently extracted constraints, decisions, and active tasks all remain active after `mergeCandidates()`.
+
+## Tests
+- Focused extractor tests:
+  - `cd /home/alex/dotfiles/.worktrees/context-manager-extension/.pi/agent/extensions/context-manager && npx tsx --test src/extract.test.ts`
+  - Result: 4 tests passed
+- Full extension suite:
+  - `cd /home/alex/dotfiles/.worktrees/context-manager-extension/.pi/agent/extensions/context-manager && npm test`
+  - Result: 15 tests passed
+
+## Files Changed
+- Modified: `.pi/agent/extensions/context-manager/src/extract.ts`
+- Modified: `.pi/agent/extensions/context-manager/src/extract.test.ts`
+- Created: `.pi/reviews/context-manager-task3-fix-report.md`
+
+## Self-Review Findings
+- The fix stays focused on Task 3 behavior and keeps all public function signatures unchanged.
+- No ledger changes were needed; Task 2 deterministic merge behavior remains covered by the existing ledger tests and the full suite still passes.
+- The new interaction test exercises the real extractor-to-ledger path that the review flagged as missing.
+
+## Concerns
+- The extractor still uses heuristic subject generation for independently extracted items, so semantically related decisions restated in different messages will coexist unless a future task adds stronger semantic matching. That is intentional for this focused fix and avoids the reported overwrite bug.