test: 八项无头回归测试（道具/弹道/Boss/海面/地面单位/浮游炮/炸弹/冒烟模拟）

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

tests/smoke_sim.gd

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+extends SceneTree
+## 冒烟测试（时间驱动，与无头模式实际帧率无关）：
+## 主动模式：模拟移动+按住开火跑满 110s，覆盖波次→Boss 战→下一轮全链路；
+## idle 模式：站桩 75s 被打死，覆盖掉命/游戏结束。
+## 运行：godot --headless -s tests/smoke_sim.gd [-- idle]
+
+const ACTIVE_DURATION := 110.0
+const IDLE_DURATION := 75.0
+
+var _time := 0.0
+var _duration := ACTIVE_DURATION
+var _next_print := 10.0
+var _next_bomb := 30.0
+var game: Game
+var idle := false
+
+
+func _initialize() -> void:
+	idle = OS.get_cmdline_user_args().has("idle")
+	if idle:
+		_duration = IDLE_DURATION
+	var scene := load("res://scenes/game.tscn") as PackedScene
+	game = scene.instantiate()
+	root.add_child(game)
+	if not idle:
+		Input.action_press("fire")
+	print("[smoke] game scene instantiated (idle=%s)" % str(idle))
+
+
+func _process(delta: float) -> bool:
+	# 游戏结束确认后会切回标题场景，模拟随之终止
+	if not is_instance_valid(game):
+		print("[smoke] left game scene (back to title) — stopping simulation")
+		return true
+	_time += delta
+	if not idle:
+		# 左右往返扫射（1.5s 周期），模拟真实操作
+		if fmod(_time, 1.5) < 0.75:
+			Input.action_release("move_left")
+			Input.action_press("move_right")
+		else:
+			Input.action_release("move_right")
+			Input.action_press("move_left")
+
+	# 每 10 秒打印一次局面快照
+	if _time >= _next_print:
+		_next_print += 10.0
+		var boss_alive := is_instance_valid(game._boss)
+		print("[smoke] t=%ds state=%d score=%d lives=%d bombs=%d boss=%s bar=%s enemies=%d pbullets=%d ebullets=%d" % [
+			int(_time), game.state, game.score, game.lives, game.player.bombs,
+			str(boss_alive), str(game._boss_bar_bg.visible and boss_alive),
+			(game.get_node("Enemies") as Node2D).get_child_count(),
+			(game.get_node("PlayerBullets") as Node2D).get_child_count(),
+			(game.get_node("EnemyBullets") as Node2D).get_child_count(),
+		])
+
+	# 主动模式每 30 秒投一颗炸弹（无头无法可靠模拟 just_pressed 边沿，直调公开接口）
+	if not idle and _time >= _next_bomb:
+		_next_bomb += 30.0
+		game.player.use_bomb()
+
+	if _time >= _duration:
+		print("[smoke] finished, no crash")
+		return true
+	return false