ClayGrounds v0.4.2 — Custom Entity Motion

- Added a 40-tick per-entity animation clock.
- Added smooth item-display interpolation for all custom enemy visual bodies.
- Added distinct idle/locomotion-style motion profiles for Clayling, SunScorched, Vinecrawler, Mossbound, Canopy Fang, Claycrest Archer, Ruins Sentinel, Kilnbound, and Shorewarden.
- Animation stays on the visual display only: carrier AI, hitboxes, combat stats, and proven v0.4.0 alignment remain unchanged.
- Load still purges stale visual bodies so existing worlds immediately recreate them with v0.4.2 animation tags.
