Merge branch 'fix/handle-resolution-and-reconciliation-tests'
Fixes two backlog issues:
1. Post comment_count reconciliation - Added tests proving it works
2. Handle resolution for block/unblock endpoints - Full implementation
Changes include:
- 15 new integration tests (all passing)
- Handle resolution with proper error handling (400/404/500)
- Updated documentation in PRD_BACKLOG.md
- Code formatting compliance with gofumpt