View > Face Boxes (and a toolbar button in the loupe) hides or shows the boxes.
Hovering a box shows a × in its corner; clicking it runs the new undoable
`photo.removeRegion {id?, index}`, a catalog-only edit. The XMP sidecar is
never rewritten for it, even with auto-write on (a `skip_auto_write` flag
consumed when the command ends), because the sidecar writer builds a fresh
packet that does not carry the regions: reading the metadata from the file
brings a removed region back. A test with a real sidecar proves the file stays
byte for byte, that ordinary edits still auto-write, and that undo restores it.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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