# 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.