style: apply gdformat formatting across the entire project

Auto-format all GDScript files using gdformat from gdtoolkit.
This is a baseline formatting pass to ensure consistent style:

- Normalizes indentation and spacing
- Wraps long lines to 100 characters
- Removes trailing whitespace
- Standardizes blank lines between functions

68 files reformatted, 8 files left unchanged (3rd-party addon files
with parse errors excluded).

demo/src/Enemy.gd

@@ -23,7 +23,9 @@ func _process(p_delta: float) -> void:
 
 
 func is_on_nav_mesh() -> bool:
-	var closest_point := NavigationServer3D.map_get_closest_point(nav_agent.get_navigation_map(), global_position)
+	var closest_point := NavigationServer3D.map_get_closest_point(
+		nav_agent.get_navigation_map(), global_position
+	)
 	return global_position.distance_squared_to(closest_point) < nav_agent.path_max_distance ** 2
 
 
@@ -37,9 +39,9 @@ func _physics_process(p_delta: float) -> void:
 		var velocity_xz := (next_path_position - current_agent_position).normalized() * MOVE_SPEED
 		velocity.x = velocity_xz.x
 		velocity.z = velocity_xz.z
-	
+
 	velocity.y -= 40 * p_delta
-	
+
 	if nav_agent.avoidance_enabled:
 		nav_agent.set_velocity(velocity)
 	else: