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/waypoint_context.gd

@@ -10,6 +10,7 @@ const DELETE_WALK := 1
 const INSERT_BEFORE := 2
 const INSERT_AFTER := 3
 const EDIT_TRIGGER_RULES := 4
+const ACTION_RUNNER := preload("res://scripts/stickman_action_runner.gd")
 
 const _EDIT_TRIGGER_IDX := 5  # item position of the trigger-rules entry (after a separator at 4)
 
@@ -25,7 +26,11 @@ func _init() -> void:
 
 
 ## Updates the trigger-rules entry (count / enabled) and pops up at `rect`.
-func popup_for(rect: Rect2i, trigger_rule_count: int) -> void:
+func popup_for(rect: Rect2i, trigger_rule_count: int, queue_status: int = ACTION_RUNNER.QueueStatus.NOT_STARTED) -> void:
+	var consumed: bool = queue_status == ACTION_RUNNER.QueueStatus.COMPLETED or queue_status == ACTION_RUNNER.QueueStatus.INTERRUPTED
+	set_item_disabled(get_item_index(EDIT_WALK), consumed)
+	set_item_disabled(get_item_index(INSERT_BEFORE), consumed or queue_status == ACTION_RUNNER.QueueStatus.ACTIVE)
+	set_item_disabled(get_item_index(INSERT_AFTER), consumed)
 	if trigger_rule_count > 0:
 		set_item_text(_EDIT_TRIGGER_IDX, "⚡ Edit Trigger Rules (%d rule%s)" % [trigger_rule_count, "" if trigger_rule_count == 1 else "s"])
 		set_item_disabled(_EDIT_TRIGGER_IDX, false)