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

actors/matador/spear.tscn

@@ -0,0 +1,15 @@
+[gd_scene format=3 uid="uid://c8spearwrap01"]
+
+[ext_resource type="PackedScene" uid="uid://jepc74w8opbu" path="res://Assets/spear.glb" id="1_spearglb"]
+
+[sub_resource type="CapsuleShape3D" id="CapsuleShape3D_shaft"]
+radius = 0.13
+height = 2.2
+
+[node name="Spear" type="Node3D"]
+
+[node name="spear" parent="." instance=ExtResource("1_spearglb")]
+
+[node name="HitShape" type="CollisionShape3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.371139e-08, -1, 0, 1, -4.371139e-08, 0, 0, 0.79)
+shape = SubResource("CapsuleShape3D_shaft")