migration-script-runner / msr-core / bdb78ebf-3e4e-430a-b93f-f782f39319e4

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#82: Add configurable duplicate timestamp detection

- Added DuplicateTimestampMode enum (WARN, ERROR, IGNORE)
- Added duplicateTimestampMode property to Config (default: WARN)
- Updated MigrationService.validateNoDuplicateTimestamps() to support all three modes
- Created test fixtures in test/fixtures/migrations-duplicates/
- Added 6 integration tests covering ERROR, WARN, IGNORE, and default behavior
- Updated migration-settings.md with comprehensive documentation

Default behavior (WARN) alerts developers about duplicate timestamps without blocking execution, while ERROR mode enforces strict uniqueness for production.
IGNORE mode available for scenarios with external ordering guarantees.

Breaking change: Duplicate timestamps now trigger warnings by default.
Use duplicateTimestampMode = DuplicateTimestampMode.IGNORE to restore previous silent behavior

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