feat(clean-release): complete and verify backend test suite (33 passing tests)
- Relocated and standardized tests for clean_release subsystem into __tests__ sub-packages. - Implemented missing unit tests for preparation_service, audit_service, and stages. - Enhanced API contract tests for candidate preparation and compliance reporting. - Updated 023-clean-repo-enterprise coverage matrix with final verification results. - Fixed relative import issues and model validation mismatches during test migration.
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