M2M tag registry: Rush / Hold for QC / Damaged / Customer Sample.
Each rack can carry many tags; tags surface as coloured chips on the
plant-overview rack rows + Move Rack dialog (Task 13).
Plating → Configuration → Rack Tags menu (sequence 48).
post_init_hook seeds 4 starters — idempotent (no-op if any exist).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>