- New 'bd duplicates' command finds content duplicates across database
- Groups by content hash (title, description, design, acceptance criteria)
- Chooses merge target by reference count or smallest ID
- Supports --auto-merge and --dry-run flags
- Added --dedupe-after flag to 'bd import' for post-import detection
- Comprehensive test coverage for duplicate detection
- Updated AGENTS.md and ADVANCED.md with usage examples
Amp-Thread-ID: https://ampcode.com/threads/T-6f99566f-c979-43ed-bd8f-5aa38b0f6191
Co-authored-by: Amp <amp@ampcode.com>