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

tests/ragdoll_perf_test.gd

@@ -65,7 +65,7 @@ func _spawn_one() -> Node3D:
 
 func _run() -> void:
 	# Warm up: first instance pays one-time import/JIT/shader costs that would skew sample 1.
-	_matador = load("res://Matador.tscn") as PackedScene
+	_matador = load("res://actors/matador/matador.tscn") as PackedScene
 	var warm := _spawn_one()
 	await process_frame
 	warm.call(&"apply_ability_hit", Vector3(1.0, 0.0, 0.0), 12.0)