ClayGrounds v0.4.3 — Articulated Entity Rigs

- Replaces the nearly-invisible whole-model bob from v0.4.2 with genuine multi-part display rigs.
- Splits all nine custom mobs into independently pivoted body parts while preserving the proven v0.4.2 bind pose, textures, scale, and ground alignment.
- Adds visible 32-tick articulated loops with head turns, arm/leg swings, body sway, and creature-specific limb/tail motion.
- Canopy Fang and Vinecrawler use alternating multi-leg gait cycles.
- Claycrest Archer keeps its bow attached to the animated right-arm assembly.
- Ruins Sentinel keeps its shield attached to the animated right-arm assembly.
- Shorewarden gains independent head and paired claw/arm motion.
- Rig pieces are synchronized to carrier position/yaw every tick and self-recreate if an individual display part is missing.
- Death cleanup now removes every nearby rig part instead of only one item display.
- No global texture/opacity changes; the v0.4.2 Fang material fix and v0.4.1 opaque entity textures are preserved.
