[JaXt0r]

Merge order: 1a → 1b → 1c → 1d → 2a → 2b → 3a → 3b → 3c → 4a → 4b → 4c, all into engine/hvr-replacement (no stacking). Each branch still contains the commits of the earlier steps, so after the earlier PR is merged the diff of this one shrinks to its own step. Plan: Docs/HVR-replacement/.

Description

Phase 4b: chest lids on the Xri backend (needs 4a).

• oCMobContainer.prefab lid (UnityMCP): VrHinge (axis X, 0-110°) + GothicGrabInteractable (saved disabled, enabled by XriInteractableBridge on Xri) instead of XRSimpleInteractable + the interim VrChestLidToggle (deleted). HVR parts unchanged.
• IVrHinge gets Opened/Closed events. VrHinge raises them; HvrHingeBridge raises them from HVRPhysicsDoor.Opened/Closed with the same once-per-transition polling HvrPhysicsChest had.
• VrChestSlots subscribes to VrHinges.FindActive(this) → backend-neutral; HvrPhysicsChest no longer calls the slots (only disables itself on other backends).
• No HVR code copied.

To test

• - Hvr: open a chest by physics → content appears; close → slots hidden; reopen → same items; lock-pick a locked chest. Unchanged (events now go through HvrHingeBridge, may arrive one frame later).
• - Xri: grab the lid and pull → opens up to 110°, content appears; take an item; push the lid closed → slots hidden; reopen → same items, nothing doubled.
• - Xri: a locked chest doesn't open; pick the lock → it unlocks and opens a bit.
• Tested (Xri + simulator, scripted hand, G1 small crate at (51, 60, 287)): open/clamp at 110° with 5 items spawned, take one, close → Closed once and slots hidden, reopen → same 4 items, Lock() holds against a pulling hand, Unlock() opens ~14°.
• Not tested: Hvr chest in play (code review: same polling, mutually exclusive IsActive of the two hinges), real lock-pick by hand, audible sounds, headset, save → load with an open chest.
• Known: on Xri the lid must be pulled by hand (no use-to-open anymore); no gravity on the lid, it stays where it's let go and only closes softly below 5°.

Test on (delete if irrelevant)

• PCVR
• Mobile VR (Quest/Pico)

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