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# Implementation Summary

**Session ID**: `phase17-session04-web-store-and-cockpit-notice-board` **Package**: `apps/web, packages/protocol` **Completed**: 2026-06-05 **Duration**: \~3 hours

***

## Overview

Implemented the web-side Notice Board parity layer for Phase 17. The session added a pure normalization helper for canonical and compatibility payloads, updated the web store to handle hydrate, message, and resolve events with target visibility and dedupe rules, refreshed the cockpit Notice Board to render compact coordination metadata, and aligned the shell copy with real local coordination states.

The work stayed local-first. It preserved compatibility with older notice shapes while avoiding claims about hosted identity, production auditability, or broader collaboration guarantees.

***

## Deliverables

### Files Created

| File                                                                                                | Purpose                                                                                            | Lines |
| --------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- | ----- |
| `apps/web/src/lib/noticeBoard.ts`                                                                   | Web Notice Board normalization, visibility, ordering, and resolve helpers                          | \~240 |
| `apps/web/tests/noticeBoardStore.test.ts`                                                           | Store reducer coverage for hydrate, message, resolve, target visibility, and compatibility aliases | \~240 |
| `apps/web/tests/NoticeBoard.test.tsx`                                                               | Component coverage for compact rendering, states, filters, and expansion accessibility             | \~260 |
| `.spec_system/specs/phase17-session04-web-store-and-cockpit-notice-board/validation.md`             | Session validation record                                                                          | \~180 |
| `.spec_system/specs/phase17-session04-web-store-and-cockpit-notice-board/IMPLEMENTATION_SUMMARY.md` | Session closeout summary                                                                           | \~70  |

### Files Modified

| File                                                                                              | Changes                                                                                                    |
| ------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- |
| `apps/web/src/store/useGameStore.ts`                                                              | Normalized hydrate/message/resolve events and applied identity-aware target filtering.                     |
| `apps/web/src/components/NoticeBoard.tsx`                                                         | Rendered canonical fields, compact metadata, empty/disconnected/filtered states, and accessible expansion. |
| `apps/web/src/lib/cockpitShell.ts`                                                                | Aligned Notice Board loading, offline, and closed-stream copy with real coordination behavior.             |
| `apps/web/tests/CockpitShell.test.tsx`                                                            | Updated shell expectations for the Notice Board state copy.                                                |
| `apps/web/package.json`                                                                           | Bumped the package patch version from `0.1.43` to `0.1.44`.                                                |
| `.spec_system/specs/phase17-session04-web-store-and-cockpit-notice-board/spec.md`                 | Marked the session complete and validated.                                                                 |
| `.spec_system/specs/phase17-session04-web-store-and-cockpit-notice-board/tasks.md`                | Confirmed all tasks complete.                                                                              |
| `.spec_system/specs/phase17-session04-web-store-and-cockpit-notice-board/implementation-notes.md` | Recorded the final validation step.                                                                        |
| `.spec_system/PRD/phase_17/session_04_web_store_and_cockpit_notice_board.md`                      | Marked the phase session complete.                                                                         |
| `.spec_system/PRD/phase_17/PRD_phase_17.md`                                                       | Updated phase progress and session tracking.                                                               |
| `.spec_system/state.json`                                                                         | Recorded Session 04 completion and cleared the current session.                                            |

***

## Technical Decisions

1. **Pure helper first**: Centralized Notice Board normalization and visibility in `apps/web/src/lib/noticeBoard.ts` so the store and tests share one deterministic contract.
2. **Compact UI boundary**: Kept the cockpit board bounded to six visible rows by default and added explicit expansion controls instead of an unbounded scrolling feed.

***

## Test Results

| Metric   | Value                                                  |
| -------- | ------------------------------------------------------ |
| Tests    | Focused Notice Board store, component, and shell tests |
| Passed   | 33                                                     |
| Coverage | N/A                                                    |

***

## Lessons Learned

1. Compatibility aliases are easiest to preserve when canonical normalization happens before store mutation.
2. Distinct loading, offline, disconnected, and filtered states keep the board usable without implying hosted behavior.

***

## Future Considerations

Items for future sessions:

1. Continue the remaining Phase 17 sessions for CLI, hooks, relay, and lifecycle automation.
2. Keep phase-level validation evidence aligned as the Notice Board port advances through the remaining session loop.

***

## Session Statistics

* **Tasks**: 24 completed
* **Files Created**: 5
* **Files Modified**: 11
* **Tests Added**: 3
* **Blockers**: 0 resolved


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