ClayGrounds v0.2.0 — New Adventure / Worldgen Patch

Fixed
- New Adventure no longer depends on claygrounds:claygrounds_void during pre-save creation.
- DAI can create the ClayGrounds save through the proven built-in minecraft:flat preset path.
- Removed duplicate unconditional full-map generation from player/first_join.

Changed
- Replaced rectangular region foundations with organic contour-based islands and elevation tiers.
- Preserved authored Solmere structures, profession altars, region paths, dungeon geometry, and gameplay anchors.
- Added five ClayGrounds DAI recognition definitions for generated region/landmark classification.
- Kept build/all, build/town, build/strand, build/verdant, build/ruins, build/grotto, and build/sea as compatibility wrappers.

Resource Pack Compatibility
- No v0.2.0 CustomModelData IDs were renumbered or removed.
- Enemy visual host/display logic is unchanged.
- Class weapon/skill item model bindings are unchanged.
