test: full builder rewrite with player state machine, camera, and manual _ready()

- _build_player: creates Player (CharacterBody3D) with capsule,
  MovementStateMachine + 6 state children, attaches movement script
- Calls player._ready() manually after set_script (GDScript
  set_script does not auto-trigger _ready)
- Camera parented under Player so it follows movement
- Restores _build_camera() which was accidentally dropped

debug/test_level_builder.gd

@@ -1,7 +1,7 @@
 extends Node3D
 class_name TestLevelBuilder
 ## Builds the test level ONLY from code — no .tscn SubResource references.
-## Automatically builds when attached to the TestLevel root node.
+## One-click playtest: attach to TestLevel root, F5.
 
 func _ready() -> void:
 	build()
@@ -10,14 +10,15 @@ func build() -> void:
 	_build_floor()
 	_build_walls()
 	_build_lighting()
+	_build_player()
 	_build_camera()
 	_build_ui()
 
 
 func _box_static(pos: Vector3, size: Vector3, color: Color) -> StaticBody3D:
 	var body := StaticBody3D.new()
-	body.position = pos
 	body.name = "Static_" + str(pos)
+	body.position = pos
 	add_child(body)
 	var shape := CollisionShape3D.new()
 	shape.shape = BoxShape3D.new()
@@ -38,7 +39,6 @@ func _build_floor() -> void:
 
 
 func _build_walls() -> void:
-	# Thin, tall walls for wallrun / walljump testing
 	_box_static(Vector3(0, 3, -15), Vector3(30, 6, 0.4), Color(0.55, 0.45, 0.35))
 	_box_static(Vector3(15, 3, 0),  Vector3(0.4, 6, 30), Color(0.55, 0.45, 0.35))
 	_box_static(Vector3(-15, 3, 0), Vector3(0.4, 6, 30), Color(0.55, 0.45, 0.35))
@@ -55,18 +55,43 @@ func _build_lighting() -> void:
 	add_child(sun)
 
 
+func _build_player() -> void:
+	var player := CharacterBody3D.new()
+	player.name = "Player"
+	player.position = Vector3(0, 1.5, 8)
+	add_child(player)
+	var shape := CollisionShape3D.new()
+	shape.shape = CapsuleShape3D.new()
+	shape.shape.radius = 0.4
+	shape.shape.height = 1.8
+	player.add_child(shape)
+	var sm := Node.new()
+	sm.name = "MovementStateMachine"
+	player.add_child(sm)
+	for state_name in ["ground", "air", "wall_run", "wall_cling", "slide", "dash"]:
+		var st := Node.new()
+		st.name = "state_" + state_name
+		sm.add_child(st)
+	var mover_script = load("res://movement/player_movement_controller.gd")
+	if mover_script:
+		player.set_script(mover_script)
+		# set_script after node is in tree does not auto-call _ready()
+		# Manually initialize the controller
+		if player.has_method("_ready"):
+			player._ready()
+
+
 func _build_camera() -> void:
 	var cam := Camera3D.new()
 	cam.name = "FpsCamera"
 	cam.current = true
 	cam.position = Vector3(0, 1.7, 0)
 	cam.fov = 90.0
+	var player_node = get_node_or_null("Player")
+	if player_node:
+		player_node.add_child(cam)
+	else:
 		add_child(cam)
-	# Spawn marker
-	var spawn := Node3D.new()
-	spawn.name = "PlayerSpawn"
-	spawn.position = Vector3(0, 1.5, 8)
-	add_child(spawn)
 
 
 func _build_ui() -> void: