- Add EntityRef type for structured entity references with URI support
- Add Creator field to Issue for tracking who created work
- Add Validation type and Validations field for proof-of-stake approvals
- Fix RemoveDependency FK violation on external deps (bd-a3sj)
- Include all new fields in content hash computation
- Full test coverage for all new types
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Co-Authored-By: Claude <noreply@anthropic.com>