AJ ONeal 8869ad6914
fix(sqlmigrate): address low-severity review findings
Core library:
- Replace O(n*m) isApplied linear scan with map lookups (appliedSets)
- Wrap exec errors with ErrExecFailed in Up and Down
- Add tests for Collect with subpath and empty subpath
- Add tests for Latest and Drop convenience wrappers
- Add tests for Applied() error propagation in Up/Down/GetStatus
- Add tests for ErrExecFailed wrapping
- Add tests for context propagation and cancellation
- Store received context in mock for propagation assertions

shmigrate:
- Return ErrExecFailed on missing migration file instead of writing
  a comment and continuing
- Use r.FS for file stat (consistent with Applied), falling back
  to os.Stat when FS is nil
2026-04-09 17:16:27 -06:00
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