sync local pi changes

.pi/reviews/context-manager-task5-implementer-report.md

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+# Context Manager Task 5 Implementer Report
+
+## Status
+- Completed Task 5.
+- Required tests pass.
+- Full extension test suite passes.
+
+## What you implemented
+- Added `src/summaries.ts` with:
+  - `buildCompactionSummary()`
+  - `buildBranchSummary()`
+  - `buildResumePacket()`
+- Added `src/persist.ts` with:
+  - `SNAPSHOT_ENTRY_TYPE`
+  - `RuntimeSnapshot`
+  - `serializeSnapshot()`
+  - `deserializeLatestSnapshot()`
+- Added `src/runtime.ts` with `createContextManagerRuntime()` to:
+  - ingest transcript slices via `extractCandidates()` + `mergeCandidates()`
+  - observe token pressure via `zoneForTokens()`
+  - build packets via `buildContextPacket()`
+  - expose compaction, branch, and resume summaries
+  - update mode and context window
+  - snapshot and restore runtime state
+- Added the required tests for summaries, persistence, and runtime.
+
+## What you tested and results
+1. Confirmed the new tests initially failed because the new source files did not exist.
+   - Command: `cd .pi/agent/extensions/context-manager && npx tsx --test src/summaries.test.ts src/persist.test.ts src/runtime.test.ts`
+   - Result: failed with `ERR_MODULE_NOT_FOUND` for `summaries.ts`, `persist.ts`, and `runtime.ts`
+2. Ran the required Task 5 tests after implementation.
+   - Command: `cd .pi/agent/extensions/context-manager && npx tsx --test src/summaries.test.ts src/persist.test.ts src/runtime.test.ts`
+   - Result: 5/5 passing
+3. Ran the full extension test suite.
+   - Command: `cd .pi/agent/extensions/context-manager && npm test`
+   - Result: 29/29 passing
+
+## Files changed
+- Created `.pi/agent/extensions/context-manager/src/summaries.ts`
+- Created `.pi/agent/extensions/context-manager/src/persist.ts`
+- Created `.pi/agent/extensions/context-manager/src/runtime.ts`
+- Created `.pi/agent/extensions/context-manager/src/summaries.test.ts`
+- Created `.pi/agent/extensions/context-manager/src/persist.test.ts`
+- Created `.pi/agent/extensions/context-manager/src/runtime.test.ts`
+- Created `.pi/reviews/context-manager-task5-implementer-report.md`
+
+## Self-review findings
+- Implementation matches the task-provided API and file list.
+- Reused existing `config`, `ledger`, `extract`, and `packet` modules as requested.
+- Kept scope to Task 5 only; did not start Task 6.
+- Verified the red/green cycle for the new tests.
+
+## Any concerns
+- No functional concerns from this task.
+- There are unrelated untracked review files already present in `.pi/reviews/`; they were not included in this task’s changes.