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/matador_spear_test.gd

@@ -7,7 +7,7 @@ extends SceneTree
 # physics_layers.gd is pure constants (safe to preload); spear_projectile.gd references the
 # Settings autoload, whose global identifier isn't registered when a --script entry compiles its
 # preloads — so it's loaded at runtime inside _run instead, once the autoloads exist.
-const PhysicsLayers = preload("res://physics_layers.gd")
+const PhysicsLayers = preload("res://systems/combat/physics_layers.gd")
 
 var _pass := 0
 var _fail := 0
@@ -44,8 +44,8 @@ func _run() -> void:
 	await physics_frame
 
 	# Launch a spear flat, dead-on from 3 m out; low gravity so the short flight stays level.
-	var spear_script := load("res://spear_projectile.gd")
-	var mesh := (load("res://Spear.tscn") as PackedScene).instantiate() as Node3D
+	var spear_script := load("res://actors/matador/spear_projectile.gd")
+	var mesh := (load("res://actors/matador/spear.tscn") as PackedScene).instantiate() as Node3D
 	root.add_child(mesh)
 	var origin := Vector3(0.0, 0.0, -3.0)
 	var spear := spear_script.launch(root, mesh, origin, Vector3(0.0, 0.0, 12.0), 0.05) as RigidBody3D