sync local pi changes

.pi/reviews/context-manager-task2-fix-report.md

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+# Context Manager Task 2 Fix Report
+
+## Status
+Completed.
+
+## What changed
+- Updated `.pi/agent/extensions/context-manager/src/ledger.ts` so `mergeCandidates()` only supersedes the current active item when the incoming candidate is at least as new by `timestamp`.
+- Stale same-slot candidates now remain archived instead of reactivating older state when merges arrive out of order.
+- Kept `createId(candidate)` intact and added a small internal uniqueness guard so same-slot same-timestamp candidates receive distinct item IDs in practice.
+- Added regression coverage in `.pi/agent/extensions/context-manager/src/ledger.test.ts` for:
+  - out-of-order same-slot merges, and
+  - same-slot same-timestamp ID collisions.
+
+## Test results
+- `cd /home/alex/dotfiles/.worktrees/context-manager-extension/.pi/agent/extensions/context-manager && npx tsx --test src/ledger.test.ts`
+  - Result: 5/5 tests passed.
+- `cd /home/alex/dotfiles/.worktrees/context-manager-extension/.pi/agent/extensions/context-manager && npm test`
+  - Result: 10/10 tests passed.
+
+## Files changed
+- `.pi/agent/extensions/context-manager/src/ledger.ts`
+- `.pi/agent/extensions/context-manager/src/ledger.test.ts`
+- `.pi/reviews/context-manager-task2-fix-report.md`
+
+## Self-review findings
+- Scope stayed limited to the two reviewed correctness issues and their regression tests.
+- Public API and overall Task 2 structure were preserved.
+- `createId(candidate)` remains the base ID format from the original Task 2 implementation.
+
+## Any concerns
+- None.