Reorganize the codebase into role-based folders (snake_case)

Move the 40-odd root-level scripts and scenes into a tree that groups by role,
per the approved roadmap (WS2/WS3): actors/{player,matador,bear}, systems/{combat,
fx,input,debug,render,crowd,config}, ui/, props/ (was tscn_s/). Rename the shell
scene.tscn -> levels/game_shell.tscn and every PascalCase scene to snake_case
(Player.tscn -> player.tscn, MainMenu.tscn -> main_menu.tscn, etc.) so the
case-insensitive web/macOS filesystems can't alias two files together.

Done as a scripted move: each file travels with its .uid; every quoted res:// path
across scenes, scripts, .tres, and project.godot's 9 autoloads is rewritten; the
.godot uid/class cache is rebuilt from scratch. Scenes still resolve by uid, so the
rewrite is belt-and-suspenders. Lint globs (run_tests.sh + both CI workflows) now
walk the new dirs; an orphan animation_tree.gd.uid and 7 pre-existing trailing-
whitespace lints (barrel/torch, never covered by the old root-only glob) are cleaned.

Full suite green on both sides. Asset consolidation (Assets/Animations/fonts ->
art/) is deferred — moving imported .glb/.png/.ttf is safer done in the editor.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017KoYBYQgRyY1zDHXMsXY3V

props/barrel_simple.gd

@@ -0,0 +1,41 @@
+extends StaticBody3D
+## A smashable lobby barrel. Joins the &"barrel" group so the HUD can tally how many
+## remain and fire the "cleared the lobby" reward once the last one bursts.
+
+signal destroyed
+
+# Preload the broken barrel scene
+const BARREL_BROKEN_SCENE = preload("res://props/barrel_broken.tscn")
+
+var _destroyed := false
+
+
+func _ready() -> void:
+	add_to_group(&"barrel")
+
+
+func destroy_barrel():
+	# Guard against a double hit in the same frame counting the same barrel twice.
+	if _destroyed:
+		return
+	_destroyed = true
+
+	# 1. Instantiate the broken pieces
+	var broken_instance = BARREL_BROKEN_SCENE.instantiate()
+
+	# 2. Place the fragments exactly where the intact barrel currently is
+	broken_instance.global_transform = self.global_transform
+
+	# 3. Add the fragments to the main game tree
+	get_parent().add_child(broken_instance)
+
+	# 4. (Optional) Apply a physics push to the fragments if you want an explosive effect
+	for child in broken_instance.get_children():
+		if child is RigidBody3D:
+			# Pushes pieces slightly outward and upward
+			var random_direction = Vector3(randf_range(-1, 1), randf_range(0.5, 1.5), randf_range(-1, 1)).normalized()
+			child.apply_central_impulse(random_direction * 5.0)
+
+	# 5. Announce the smash (the HUD counts down remaining barrels) and remove the barrel
+	destroyed.emit()
+	queue_free()