Reorganize into role-based folders and consolidate art

Move every script and scene into role-based directories (actors/, systems/, ui/,
levels/, props/) and all raw art under art/ (grouped by role, snake_case,
Extract-Textures GLBs), dropping Blender version-suffix noise. Filenames are
snake_case (PascalCase reserved for class_name) to avoid case-insensitive
filesystem aliasing on the web/macOS targets. Routes the bull's hits through the
typed DamageEvent pipeline and wires the bull's abilities to the Fx library.
Updates CLAUDE.md's folder-layout overview to match.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CCyaJPTHCH9EDthpf4A5Sj

.gitignore

@@ -2,13 +2,17 @@
 .godot/
 /android/
 
+# Godot editor autosave scratch files (e.g. Bear.tscn12015901897.tmp)
+*.tmp
+
 # JetBrains IDE — contains absolute paths (Godot binary, SDK dirs), varies per user
 .idea/
 
 # Blender render previews (generated by render_anim_preview.py)
-Blender/preview/
+art/blender/preview/
 
-Blender/*.blend1
+# Blender auto-save backups (.blend1, .blend2, … — Blender rewrites these on every save)
+art/blender/*.blend[0-9]
 
 # Test output (generated screenshots, frame strips)
 tests/output/