feat(playable): 首个 Mac 联网内测版 STB-01 soak 工具与发布状态文档

- 新增 script/playable_soak.sh：先做 soak 配置/资源校验，无 --allow-gameplay
  只校验不启动客户端；N(>=10) 次独立正常退出运行 + 墙钟 soak，失败即停止后续
  运行并记 BLOCKED；写本批次 release-manifest.json 后聚合
- run_client_gate.sh：确认的故障代理对所有 suite 启动（共享场景的退出运行也经代理）；
  soak 超时下限只约束 soak 客户端（validate_soak 增加 soak_client 参数）
- 新增本地 127.0.0.1 故障代理、RSS 采样/内存判定、窗口/指标/流程模块及其测试
- forest_mob_render_test 输出 PASS/FAIL 标记，供 rendering_batch_test.sh 识别
- 新增 docs/FIRST-MAC-PLAYABLE-STATUS.md：如实记录 PASS/BLOCKED、已知问题与环境需求
- .gitignore 排除本地场景配置、凭据文件与运行输出

离线回归：rendering_batch_test.sh failures=0，playable_gate_test.sh PASS，
node 夹具测试 PASS。未联网运行，未重建候选包。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ft3kXpNdLbKEfg5uDLfqVF

project/testing/playable_window.gd

@@ -0,0 +1,65 @@
+extends RefCounted
+
+## STB-RESIZE-01 的真实窗口适配器（PlayableFlow.window）。
+##
+## macOS Retina 下 DisplayServer 的窗口尺寸是物理像素，逻辑尺寸 = 物理像素 / 屏幕缩放。
+## 流程只按逻辑尺寸判定；物理像素、缩放和视口尺寸一并写进事件，Retina 的 2x 不是分辨率错误。
+## 请求尺寸超出当前屏幕可用区域（含标题栏）时如实拒绝（request_logical_size 返回 false），
+## 由流程记为 BLOCKED，不缩小目标冒充通过。headless / 全屏 / 最大化窗口不可调整。
+
+var _viewport: Viewport
+
+func _init(viewport: Viewport = null) -> void:
+	_viewport = viewport
+
+func availability() -> Dictionary:
+	if DisplayServer.get_name() == "headless":
+		return {"ok": false, "reason": "headless display server has no window"}
+	match DisplayServer.window_get_mode():
+		DisplayServer.WINDOW_MODE_FULLSCREEN, DisplayServer.WINDOW_MODE_EXCLUSIVE_FULLSCREEN:
+			return {"ok": false, "reason": "window is fullscreen; logical size switching needs windowed mode"}
+		DisplayServer.WINDOW_MODE_MAXIMIZED:
+			return {"ok": false, "reason": "window is maximized; logical size switching needs windowed mode"}
+		DisplayServer.WINDOW_MODE_MINIMIZED:
+			return {"ok": false, "reason": "window is minimized"}
+	if screen_scale() <= 0.0:
+		return {"ok": false, "reason": "screen scale unavailable"}
+	return {"ok": true, "reason": ""}
+
+func screen_scale() -> float:
+	return DisplayServer.screen_get_scale(DisplayServer.window_get_current_screen())
+
+func physical_size() -> Vector2i:
+	return DisplayServer.window_get_size()
+
+func logical_size() -> Vector2i:
+	var scale := screen_scale()
+	var size := physical_size()
+	if scale <= 0.0:
+		return size
+	return Vector2i(roundi(size.x / scale), roundi(size.y / scale))
+
+func viewport_size() -> Vector2i:
+	if _viewport == null or not is_instance_valid(_viewport):
+		return Vector2i.ZERO
+	return Vector2i(_viewport.get_visible_rect().size)
+
+## Returns false (no request sent) when the size cannot fit the usable screen area.
+func request_logical_size(size: Vector2i) -> bool:
+	var scale := screen_scale()
+	if scale <= 0.0 or size.x <= 0 or size.y <= 0:
+		return false
+	var target := Vector2i(roundi(size.x * scale), roundi(size.y * scale))
+	var screen := DisplayServer.window_get_current_screen()
+	var usable := DisplayServer.screen_get_usable_rect(screen)
+	var decorations := DisplayServer.window_get_size_with_decorations() - DisplayServer.window_get_size()
+	if target.x + decorations.x > usable.size.x or target.y + decorations.y > usable.size.y:
+		return false
+	DisplayServer.window_set_size(target)
+	# Keep the whole window on the usable area so the OS does not clamp the size back.
+	var position := DisplayServer.window_get_position()
+	var clamped := Vector2i(clampi(position.x, usable.position.x, usable.end.x - target.x - decorations.x),
+		clampi(position.y, usable.position.y, usable.end.y - target.y - decorations.y))
+	if clamped != position:
+		DisplayServer.window_set_position(clamped)
+	return true