- Add git diff for session-files using baseCommitSha with double-dot syntax
- Add merge-base fallback to find common ancestor when baseCommitSha is missing
- Add HEAD~1 fallback when merge-base fails (e.g., no remote main)
- Add 10-second in-memory cache for session-files computation
- Fix scheduler to immediately schedule tasks created via dashboard
- Add task:moved to done handler for immediate scheduling on status change
- Add comprehensive unit tests for scheduler immediate scheduling
- Add unit tests for session-files caching and base ref resolution
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