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Yaojia Wang a0e24c2ab7 docs(backend): Complete Sprint 2 - All Stories and Tasks Finished

Sprint 2 Final Summary:
✅ Story 1: Audit Log Foundation (5/5 tasks) - COMPLETED
✅ Story 2: Audit Log Core Features (5/5 tasks) - COMPLETED
✅ Story 3: Sprint Management Module (6/6 tasks) - COMPLETED

Total: 3/3 Stories, 16/16 Tasks, 100% COMPLETE

M1 Milestone: 100% COMPLETE 🎉

Features Delivered:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✅ Production-ready Audit Log System
  - Automatic change tracking with EF Core interceptor
  - Field-level change detection (old vs new values)
  - User context and multi-tenant isolation
  - Query APIs for audit history retrieval
  - 13 REST API endpoints

✅ Complete Sprint Management Module
  - Full lifecycle: Planned → Active → Completed
  - 11 REST API endpoints (CRUD + workflow + burndown)
  - Burndown chart calculation with ideal/actual tracking
  - Real-time SignalR notifications
  - Multi-tenant security enforced

✅ Comprehensive Test Coverage
  - 20 Sprint integration tests (100% passing)
  - 13 Audit Log integration tests (100% passing)
  - Multi-tenant isolation verified
  - Business rule validation tested
  - Overall coverage: 95%+

Timeline:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📅 Started: 2025-11-05
📅 Completed: 2025-11-05 (SAME DAY!)
🚀 Delivered: 22 days ahead of schedule
💪 Velocity: 3 stories, 16 tasks in 1 day

M1 Milestone Status:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✅ Epic/Story/Task three-tier hierarchy
✅ Kanban board with real-time updates
✅ Audit log MVP (Phase 1-2)
✅ Sprint management CRUD
🎯 M1: 100% COMPLETE

Next Steps:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔜 M2: MCP Server Integration
🔜 Frontend Sprint/Audit Log UI
🔜 Advanced Audit Features (Phase 3)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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