migration-script-runner / msr-core / cf3f533b-e4de-4d83-b239-30e4c45eec4b / 1

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#73: Add dry run mode for safe migration preview

Implemented dry run mode to preview migrations without executing them.

Changes:
- Added dryRun flag to Config model (default: false)
- Updated MigrationScriptExecutor to skip execution, backup, and database writes in dry run
- Added output messages showing "Would execute" and "Would ignore" counts
- Added 17 integration tests in DryRunMode.test.ts

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