Q1: Remove F9 debug toggle from GltfAnimationApplier + delete dead
GltfRenderLayer + remove keybind registration
Q2: Move HumanChairHelper from state/ to util/ — pure utility with
no state dependency. 7 import updates.
Q3: Wire NECK collar equip flow in DataDrivenBondageItem:
- Target must be tied up (V1 rule preserved)
- Distance + line-of-sight validation
- Owner added to NBT before equip via CollarHelper.addOwner()
- V2EquipmentHelper handles conflict resolution
- ModSounds.COLLAR_PUT played on success
- OwnershipComponent.onEquipped registers in CollarRegistry
