- Add GET /metrics/summary endpoint with global coverage counts and percentage
- Add GET /metrics/by-tactic endpoint with per-tactic coverage breakdown
- Handle multi-tactic techniques (comma-separated) counting in each tactic
- Add CoverageSummary and TacticCoverage Pydantic schemas
- Update README with metrics endpoints and project structure
- Add Pydantic schemas for Technique, Test and Evidence
- Add CRUD endpoints for Techniques (list with filters, detail, create, update, review)
- Add CRUD endpoints for Tests (create, detail, update, validate, reject)
- Add evidence upload with SHA-256 integrity and presigned download URLs
- Add MinIO/S3 storage client with bucket auto-creation on startup
- Add status_service to recalculate technique coverage from test results
- Add require_any_role RBAC dependency for multi-role authorization
- Update README with API endpoints reference and project structure
