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feat(06-02): create implementation roadmap for Phases 7-11 

Create comprehensive implementation roadmap for session chat:

Phase Breakdown (11-13 plans estimated):
- Phase 7: Chat Infrastructure & State Management (3 plans)
  - 7.1: Redux Slice & Core Reducers (TDD)
  - 7.2: Async Thunks & API Integration (TDD)
  - 7.3: WebSocket Integration & Selectors (TDD)
- Phase 8: Chat Window UI & Message Display (3 plans)
  - 8.1: Chat Window Shell & WindowPortal Integration
  - 8.2: Message List & Auto-Scroll
  - 8.3: Chat Button & Unread Badge
- Phase 9: Message Composition & Sending (2 plans)
  - 9.1: Message Composer & Validation (TDD)
  - 9.2: Send Message & Real-Time Delivery (TDD)
- Phase 10: Read/Unread Status Management (2 plans)
  - 10.1: Unread Tracking & Badge Updates (TDD)
  - 10.2: Channel Switching & Read State Sync
- Phase 11: Chat Finalization & Polish (3 plans)
  - 11.1: Error Handling & Retry Logic
  - 11.2: Performance Optimization & Accessibility
  - 11.3: UAT & Final Integration Testing

Risk Analysis:
- 2 HIGH risks: WebSocket deduplication, localStorage persistence
- 4 MEDIUM risks: Auto-scroll conflicts, multi-tab sync, API errors, WindowPortal styling
- 2 LOW risks: Character count validation, timestamp formatting

TDD Strategy:
- Phase 7: 100% TDD (all data layer)
- Phase 8: 50% TDD (component behavior, skip styling)
- Phase 9: 100% TDD (composition logic)
- Phase 10: 100% TDD (unread tracking)
- Phase 11: 70% TDD (error handling, skip performance)

Testing Strategy:
- Unit tests: 80%+ coverage (Redux, API, WebSocket)
- Integration tests: 7 test files (window, send, receive, badge, scroll, channel, errors)
- E2E tests: Complete workflow + multi-user scenario
- UAT: 40+ test cases across 9 categories

Complexity Estimation:
- 1.5-2x more complex than Backing Track (Phase 3: 3 plans)
- 0.6x less complex than JamTrack (Phase 5: 9 plans)
- Estimated 11-13 plans, 28-32 tasks total

Critical Decisions:
- Message virtualization: Defer until needed
- Optimistic UI updates: Implement for better UX
- localStorage persistence: Store lastReadAt timestamps
- Multi-tab sync: Defer to next milestone
- Auto-scroll strategy: Track scroll position (smart)

Deferred Features (Next Milestone):
- Server-side read/unread tracking
- File attachments
- Message search/filtering
- Message editing/deletion
- Typing indicators
- Emoji picker
- Multi-channel tabs
- Notification sounds
- Desktop notifications

Dependency graph and success metrics documented.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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