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

tests/touch_controls_test.gd

@@ -73,7 +73,7 @@ func _run() -> void:
 	# Headless boots a 64x64 root viewport, which collapses every UI rect on top of each other.
 	# Give it a real phone-ish landscape size so the joystick zone / buttons lay out sanely.
 	root.size = Vector2i(1152, 648)
-	_tc = (load("res://touch_controls.gd") as Script).new()
+	_tc = (load("res://systems/input/touch_controls.gd") as Script).new()
 	root.add_child(_tc)
 	await process_frame   # _ready builds _surface and runs the first _relayout
 	_tc._relayout()       # ensure the layout reflects the size set above