sync local pi changes

.pi/reviews/context-manager-task4-implementer-report.md

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+# Context Manager Task 4 Implementer Report
+
+## Status
+- Done
+- Implemented packet building in `.pi/agent/extensions/context-manager/src/packet.ts`
+- Implemented context pruning in `.pi/agent/extensions/context-manager/src/prune.ts`
+- Added focused tests for both modules
+
+## Changes
+- Added `buildContextPacket()` with ordered section emission, priority sorting, and packet token-cap enforcement.
+- Added `pruneContextMessages()` with recent-turn preservation and bulky old tool-result pruning.
+- Reused existing policy and ledger types from `src/config.ts` and `src/ledger.ts`.
+- Kept the implementation scoped to Task 4 only.
+
+## Tests
+- Verified red state first:
+  - `cd .pi/agent/extensions/context-manager && npx tsx --test src/packet.test.ts src/prune.test.ts`
+  - Result: failed with `ERR_MODULE_NOT_FOUND` because `src/packet.ts` and `src/prune.ts` did not exist yet
+- Verified green state after implementation:
+  - `cd .pi/agent/extensions/context-manager && npx tsx --test src/packet.test.ts src/prune.test.ts`
+- Ran full extension test suite:
+  - `cd .pi/agent/extensions/context-manager && npm test`
+
+## Files Changed
+- Created `.pi/agent/extensions/context-manager/src/packet.ts`
+- Created `.pi/agent/extensions/context-manager/src/prune.ts`
+- Created `.pi/agent/extensions/context-manager/src/packet.test.ts`
+- Created `.pi/agent/extensions/context-manager/src/prune.test.ts`
+- Created `.pi/reviews/context-manager-task4-implementer-report.md`
+
+## Self-Review Findings
+- Section ordering and token-cap behavior are covered by the packet test.
+- Pruning behavior is covered by the prune test and preserves the latest user turn.
+- No unrelated files in the extension package were modified.
+
+## Concerns
+- No known concerns.