Add global using for Xunit in test project
Enhance ImportValidatorTests with async validation and quarantine checks
Implement FileSystemQuarantineServiceTests for quarantine functionality
Add integration tests for ImportValidator to check monotonicity
Create BundleVersionTests to validate version parsing and comparison logic
Implement VersionMonotonicityCheckerTests for monotonicity checks and activation logic
- Added detailed task completion records for KMS interface implementation and CLI support for file-based keys.
- Documented security enhancements including Argon2id password hashing, audit event contracts, and rate limiting configurations.
- Included scoped service support and integration updates for the Plugin platform, ensuring proper DI handling and testing coverage.
