- Add Compactor with CompactTier1 and CompactTier1Batch methods
- Single issue and batch compaction with 5 concurrent workers
- Dry-run mode for testing without API calls
- Smart size checking: keeps original if summary is longer
- Improved Haiku prompts to emphasize compression
- Add ApplyCompaction method for setting compaction metadata
- Comprehensive tests including API integration tests
- All tests passing
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