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

tools/bake_crowd_sheet.gd

@@ -1,6 +1,6 @@
 extends SceneTree
 ## Bakes an animated-billboard sprite sheet from the existing clapping crowd figure
-## (Animations/mees_plaksutab.glb, clip "ArmatureAction") so a whole stand of
+## (art/anim/crowd_clap.glb, clip "ArmatureAction") so a whole stand of
 ## spectators can render as camera-facing quads in one draw call instead of 72 skinned
 ## skeletons. Renders FRAMES evenly-spaced poses from a front orthographic camera on a
 ## transparent background and packs them into a single-row atlas.
@@ -8,13 +8,13 @@ extends SceneTree
 ## Needs a display — script mode renders to a real window (headless is blank):
 ##   godot --script tools/bake_crowd_sheet.gd
 ##
-## Output: res://Assets/crowd_clap_sheet.png — FRAMES cells wide, TWO rows: the top row
+## Output: res://art/textures/crowd_clap_sheet.png — FRAMES cells wide, TWO rows: the top row
 ## is the front view, the bottom row is the back view. The crowd shader picks the row
 ## with FRONT_FACING so spectators show their backs when the camera is behind them.
 
-const SRC     := "res://Animations/mees_plaksutab.glb"
+const SRC     := "res://art/anim/crowd_clap.glb"
 const CLIP    := &"ArmatureAction"
-const OUT     := "res://Assets/crowd_clap_sheet.png"
+const OUT     := "res://art/textures/crowd_clap_sheet.png"
 const FRAMES  := 8
 const CELL_H  := 192      # sprite cell height in px; width derived from the figure aspect
 const PAD     := 1.12     # framing margin around the figure's bounds

tools/preview_crowd.gd

@@ -24,7 +24,7 @@ func _run() -> void:
 	root.add_child(we)
 
 	var crowd := MultiMeshInstance3D.new()
-	crowd.set_script(load("res://crowd_billboards.gd"))
+	crowd.set_script(load("res://systems/crowd/crowd_billboards.gd"))
 	crowd.set("source_path", NodePath())     # force the generated fallback stand
 	crowd.set("fallback_count", 90)
 	root.add_child(crowd)

tools/preview_crowd_scene.gd

@@ -13,7 +13,7 @@ func _init() -> void:
 
 func _run() -> void:
 	DirAccess.make_dir_recursive_absolute(OUT)
-	var ps := load("res://scene.tscn") as PackedScene
+	var ps := load("res://levels/game_shell.tscn") as PackedScene
 	var scene := ps.instantiate()
 	root.add_child(scene)
 	current_scene = scene

tools/preview_topdown.gd

@@ -13,7 +13,7 @@ func _init() -> void:
 
 func _run() -> void:
 	DirAccess.make_dir_recursive_absolute(OUT)
-	var scene := (load("res://scene.tscn") as PackedScene).instantiate()
+	var scene := (load("res://levels/game_shell.tscn") as PackedScene).instantiate()
 	root.add_child(scene)
 	current_scene = scene