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

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
 

tools/seed_fx_placeholders.gd

@@ -4,8 +4,8 @@ extends SceneTree
 ## (ported from the old code-built particles). Re-run only to reset a placeholder from scratch:
 ##   godot --headless --script tools/seed_fx_placeholders.gd
 
-const _EFFECT_SCRIPT := "res://fx/one_shot_effect.gd"
-const _GALLERY_SCRIPT := "res://fx/effect_gallery.gd"
+const _EFFECT_SCRIPT := "res://systems/fx/one_shot_effect.gd"
+const _GALLERY_SCRIPT := "res://systems/fx/effect_gallery.gd"
 
 
 func _init() -> void:
@@ -14,7 +14,7 @@ func _init() -> void:
 	_seed_spark()
 	_seed_hit_flash()
 	_seed_gallery()
-	print("Seeded FX placeholder scenes into res://fx/")
+	print("Seeded FX placeholder scenes into res://systems/fx/")
 	quit()
 
 
@@ -81,7 +81,7 @@ func _seed_blood_burst() -> void:
 	p.initial_velocity_max = 11.0
 	p.scale_amount_min = 0.5
 	p.scale_amount_max = 1.6
-	_save(p, "res://fx/blood_burst.tscn")
+	_save(p, "res://systems/fx/blood_burst.tscn")
 
 
 func _seed_slam_dust() -> void:
@@ -106,7 +106,7 @@ func _seed_slam_dust() -> void:
 	p.initial_velocity_max = 6.5
 	p.scale_amount_min = 0.6
 	p.scale_amount_max = 1.4
-	_save(p, "res://fx/slam_dust.tscn")
+	_save(p, "res://systems/fx/slam_dust.tscn")
 
 
 func _seed_spark() -> void:
@@ -129,7 +129,7 @@ func _seed_spark() -> void:
 	p.initial_velocity_max = 7.0
 	p.scale_amount_min = 0.4
 	p.scale_amount_max = 1.0
-	_save(p, "res://fx/spark.tscn")
+	_save(p, "res://systems/fx/spark.tscn")
 
 
 func _seed_hit_flash() -> void:
@@ -151,7 +151,7 @@ func _seed_hit_flash() -> void:
 	p.initial_velocity_max = 1.5
 	p.scale_amount_min = 0.8
 	p.scale_amount_max = 1.4
-	_save(p, "res://fx/hit_flash.tscn")
+	_save(p, "res://systems/fx/hit_flash.tscn")
 
 
 func _seed_gallery() -> void:
@@ -196,5 +196,5 @@ func _seed_gallery() -> void:
 	root_node.set_script(load(_GALLERY_SCRIPT))
 	var packed := PackedScene.new()
 	packed.pack(root_node)
-	ResourceSaver.save(packed, "res://fx/effect_gallery.tscn")
+	ResourceSaver.save(packed, "res://systems/fx/effect_gallery.tscn")
 	root_node.free()