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# Implementation Summary

**Session ID**: `phase05-session02-worker-api-hardening-and-client-contract` **Package**: Cross-cutting (`apps/warroom`, `packages/protocol`) **Completed**: 2026-05-29 **Duration**: 3.5 hours

***

## Overview

This session hardened the War Room Worker API contract so the Worker boundary now relies on shared protocol-owned shapes, deterministic error envelopes, and bounded safe-frame validation. The Worker and protocol packages now agree on room, participant, join, decision, socket, catch-up, and rate-limit behavior, and the session validated the result with focused typecheck and Vitest runs.

The closeout also synchronized the Phase 05 tracker, marked the session complete in project state, and bumped the repository patch version.

***

## Deliverables

### Files Created

| File                                                                                                      | Purpose                                     | Lines |
| --------------------------------------------------------------------------------------------------------- | ------------------------------------------- | ----- |
| `.spec_system/specs/phase05-session02-worker-api-hardening-and-client-contract/IMPLEMENTATION_SUMMARY.md` | Session closeout summary and handoff record | \~70  |

### Files Modified

| File                                        | Changes                                                                                            |
| ------------------------------------------- | -------------------------------------------------------------------------------------------------- |
| `.spec_system/state.json`                   | Marked the session complete, cleared `current_session`, and recorded the completion history entry. |
| `.spec_system/PRD/phase_05/PRD_phase_05.md` | Updated progress to 2/7, marked Session 02 complete, and advanced the upcoming session list.       |
| `.spec_system/PRD/PRD.md`                   | Updated the Phase 05 status map to reflect the phase in progress.                                  |
| `package.json`                              | Bumped the root project version from `0.1.51` to `0.1.52`.                                         |
| `package-lock.json`                         | Synced the root lockfile version from `0.1.51` to `0.1.52`.                                        |

***

## Technical Decisions

1. **Keep the session cross-cutting**: the contract changes span the protocol and Worker packages, so the session stays package-neutral in state and closeout records.
2. **Keep Phase 05 in progress**: only Session 02 is complete, so the tracker returns to `plansession` rather than archiving the phase.
3. **Bump the root version**: this session does not have a single package-local version target, so the repository root patch version is the correct update point.

***

## Test Results

| Metric     | Value |
| ---------- | ----- |
| Validation | PASS  |
| Tests Run  | 1979  |
| Passed     | 1978  |
| Skipped    | 1     |
| Coverage   | N/A   |

***

## Lessons Learned

1. The Worker boundary is much safer when protocol-owned validators and error envelopes are the only accepted contract source.
2. Session closeout is easiest to keep consistent when the state file, phase PRD, master PRD, and version bump are updated together.

***

## Future Considerations

Items for future sessions:

1. Session 03 should replace the web stub with room lifecycle state and connection controls.
2. Session 04 should cover approval, presence, reconnect, catch-up, and leave UX.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 1
* **Files Modified**: 5
* **Tests Added**: 0
* **Blockers**: 0 resolved


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