- Remove OutputContractLabelPath (label:path format), unify to OutputContractItem only
- Add required format field and use_judge flag to output contracts
- Add getJudgmentReportFiles() to filter reports eligible for Phase 3 status judgment
- Add supervisor-validation output contract, remove review-summary
- Enhance output contracts with finding_id tracking (new/persists/resolved sections)
- Move runtime environment directory from .runtime to .takt/.runtime
- Update all builtin pieces, e2e fixtures, and tests
