sync local pi changes

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

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+# Context Manager Task 2 Implementer Report
+
+## Status
+Completed.
+
+## What you implemented
+- Added `src/ledger.ts` with the branch-aware memory ledger types and helpers:
+  - `createEmptyLedger()`
+  - `mergeCandidates()`
+  - `getActiveItems()`
+- Implemented supersession behavior so a new active item archives the previous active item in the same `kind` + `scope` + `subject` slot.
+- Preserved coexistence between branch-scoped and session-scoped memory items.
+- Added `src/ledger.test.ts` with the required ledger coverage.
+
+## What you tested and results
+1. Ran the ledger test command before the files existed.
+   - Result: failed because `src/ledger.test.ts` did not exist.
+2. Added `src/ledger.test.ts` and ran the ledger test command again before implementing the module.
+   - Result: failed with `ERR_MODULE_NOT_FOUND` because `src/ledger.ts` did not exist.
+3. Ran the ledger test file after implementing the module.
+   - Command: `cd /home/alex/dotfiles/.worktrees/context-manager-extension/.pi/agent/extensions/context-manager && npx tsx --test src/ledger.test.ts`
+   - Result: 3/3 tests passed.
+4. Ran the full package test suite.
+   - Command: `cd /home/alex/dotfiles/.worktrees/context-manager-extension/.pi/agent/extensions/context-manager && npm test`
+   - Result: 8/8 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-implementer-report.md`
+
+## Self-review findings
+- Implementation matches the required API and logic exactly.
+- Test style matches the existing `src/config.test.ts` style.
+- Scope stayed limited to the ledger work only.
+
+## Any concerns
+- The task text referenced `/home/alex/dotfiles/.pi/agent/extensions/context-manager`, but that path does not exist in this worktree. I ran the equivalent commands in the requested worktree path instead.