feat: Implement Live Director System for interactive simulation control

- Added waypoint context updates to handle action queue statuses in `waypoint_context.gd`.
- Introduced new scene file `manwalk.scene` with terrain and stickman setup.
- Created architecture summary for the Live Director System detailing core state transitions, physics mechanics, UI elements, and action execution.
- Specified class contracts and interfaces for the Live Director implementation in `phase_12_live_director.md`.
- Defined state transitions, input handling, and queue editing mechanics for the Live Director feature.

scripts/stage_selection.gd

@@ -194,14 +194,38 @@ func _is_selectable(node: Node) -> bool:
 		return false
 	if node.get_parent() != _world:
 		return false
-	if node.name == RAGDOLL_CONTAINER_NAME:
+	if node.is_in_group("stickman_ragdoll_container") or bool(node.get_meta("stickman_ragdoll_container", false)):
 		return false
 	return true
 
 
+func _ragdoll_rig_at(world_pos: Vector2) -> Node2D:
+	if _world == null or not is_instance_valid(_world):
+		return null
+	var state: PhysicsDirectSpaceState2D = _world.get_world_2d().direct_space_state
+	var query := PhysicsPointQueryParameters2D.new()
+	query.position = world_pos
+	query.collision_mask = 0x7FFFFFFF
+	query.collide_with_areas = false
+	query.collide_with_bodies = true
+	var hits: Array[Dictionary] = state.intersect_point(query, 32)
+	for hit: Dictionary in hits:
+		var body: Object = hit.get("collider") as Object
+		if body == null or not body is Node or not (body as Node).has_meta("stickman_ragdoll_body"):
+			continue
+		var rig: Node2D = (body as Node).get_meta("stickman_rig") as Node2D
+		if rig == null or not is_instance_valid(rig) or rig.is_queued_for_deletion() or rig.get_parent() != _world:
+			continue
+		return rig
+	return null
+
+
 ## Highest World child index wins; on equal area the frontmost (first hit in
 ## reverse iteration) stays.
 func _frontmost_at(world_pos: Vector2) -> Node2D:
+	var ragdoll_hit: Node2D = _ragdoll_rig_at(world_pos)
+	if ragdoll_hit != null:
+		return ragdoll_hit
 	var children := _world.get_children()
 	var best: Node2D = null
 	var best_area := INF