1. NECK region explicitly blocked in interactLivingEntity() — prevents
V2 collars equipping without ownership setup (latent, no JSONs yet)
2. Swap rollback safety: if re-equip fails after swap failure, drop the
old bind as item entity instead of losing it silently
3. GaggingComponent: cache GagMaterial at construction time — eliminates
valueOf() log spam on every chat message with misconfigured material
4. Dual-bind prevention: check both V1 isTiedUp() AND V2 region occupied
in TyingInteractionHelper and PacketSelfBondage to prevent equipping
V2 bind on top of V1 bind
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