Shared-audit diagnostic
Failure mode absent
Stop this branch.
Failure mode present
Run a small controlled pilot.
Choose exactly one eligible annotated object
bbox → segmentation mask → localized inpainting
Verify locality, target absence, and neighbor preservation
Remove exactly one corresponding annotation on PASS
Compare original-only vs verified single-removal pilot
Reproducible benefit?
NO
Stop; keep original training data.
YES
Consider bounded targeted scaling.
Invariant
One synthetic image removes exactly one annotated target and exactly one corresponding annotation. All retained ground truth remains authoritative.
Split safety
Generate offline and reproducibly from training only. Validation, shadow holdout if used, and test remain untouched.