[JaXt0r]

Merge order: 1a → 1b → 1c → 1d → 2a → 2b → 3a → 3b → 3c, 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 3b: backpack, shoulder socket and hip holsters on the Xri backend (needs 3a).

• New BackPack XRI.prefab (slots as children, switched off while on the shoulder; returns to the shoulder when released). The HVR backpack prefab is untouched.
• XRI rig: Shoulders (backpack on the left, item holster on the right) and Waist/Holsters (two hip holsters) following the head's yaw, not its pitch (VrBodyAnchor).
• VRBackpack refresh no longer uses _tempIgnoreSocketing; it ignores only the events of items it moves itself and refills silently. This runs on Hvr too.
• Fix: socketed items had Rigidbody interpolation and flew away in moving slots; now none.
• Project compiles without GOTHIC_HVR_INSTALLED again (verified).

To test

• - Hvr: backpack off/on the shoulder, flip categories, put an item in and take it out → inventory consistent, no errors. (touched by the refresh change)
• - Xri: backpack starts on the left shoulder; take it off → slots show the category; put an item in (valid ring) → inventory +1; flip category/page; take it out → back in the world.
• - Xri: let go of the backpack → returns to the shoulder, inv_close sound.
• - Xri: holster a sword at the hip, walk, teleport (Marvin goto) → stays in the holster; draw it.
• - Xri: swim with a holstered item.
• Not tested: > 9 items paging, save → load, right shoulder holster, real weapons, UI buttons with the laser. Slot and backpack positions are copied from HVR and untuned.

Test on (delete if irrelevant)

• PCVR
• Mobile VR (Quest/Pico)

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