MODEL_ASSET_SLOT, ANCHORS_SLOT and ANCHOR_MEMBERS sit beside the other slot constants and ShipSchemaPinTests binds them
to ShipAuthoring's and ShipAnchor's [Key]s. replace_visual carries an anchor's slots past Order by Id, refuses a blank
or duplicate id, a wrong-length row and a changed ship id, and leaves the hull record and the lines alone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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