fix: empty-path re-entrancy, retry_count reset, := to = for Variant

simulation/SimulationManager.gd

@@ -98,6 +98,7 @@ func simulate_tick() -> void:
 				village.apply_npc_task(npc)
 
 			village_was_changed = true
+			npc.retry_count = 0
 
 			npc.task_complete = true
 			npc.task_state = SimNPC.TASK_STATE_IDLE
@@ -110,6 +111,15 @@ func simulate_tick() -> void:
 				if DEBUG_LOGS:
 					print("[SimulationManager] ", npc.npc_name, " gathered food while starving and is going to eat immediately.")
 
+		if npc.task_state == SimNPC.TASK_STATE_TRAVELING and npc.target_id == &"":
+			npc.retry_count += 1
+			if npc.retry_count >= 5:
+				if DEBUG_LOGS:
+					print("[SimulationManager] ", npc.npc_name, " stuck traveling without target for ", npc.retry_count, " attempts, replanning")
+				npc.task_state = SimNPC.TASK_STATE_IDLE
+				npc.current_task = ""
+				npc.retry_count = 0
+
 		if DEBUG_LOGS:
 			print(
 				npc.npc_name,
@@ -176,6 +186,8 @@ func notify_npc_arrived(npc_id: int) -> void:
 							print("[SimulationManager] ", npc.npc_name, " arrived but target ", npc.target_id, " is unavailable, replanning")
 						release_npc_reservation(npc.id)
 						npc.task_state = SimNPC.TASK_STATE_IDLE
+						npc.current_task = ""
+						npc.retry_count += 1
 						return
 
 				npc.start_working()