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/app_flow.gd

@@ -51,7 +51,13 @@ func _init() -> void:
 func start(assets_root: String = "", injected_client: Node = null) -> void:
 	_assets = assets_root
 	serverinfo = ServerInfoRes.new()
-	serverinfo.load_file("res://serverlist.txt")   # 有就用，没有用内置
+	# 联网内测的地址覆盖只在 MT_TEST_MODE=playable 生效；父运行器把同一路径交给
+	# 预检，保证预检目标与客户端真实连接目标来自同一个 ServerInfo 解析。
+	var test_serverlist := OS.get_environment("MT_PLAYABLE_SERVERLIST").strip_edges()
+	if OS.get_environment("MT_TEST_MODE") == "playable" and not test_serverlist.is_empty():
+		serverinfo.load_file(test_serverlist)
+	else:
+		serverinfo.load_file("res://serverlist.txt")   # 有就用，没有用内置
 	if injected_client != null:
 		client = injected_client
 	elif ClassDB.class_exists("M2Client"):
@@ -84,6 +90,17 @@ func start(assets_root: String = "", injected_client: Node = null) -> void:
 func state() -> int:
 	return _state
 
+# Playable-test only: choose the server/channel before the deferred autologin
+# connect runs, and return the exact address _do_connect() will use.
+func select_test_server(server_index: int, channel: int) -> Dictionary:
+	if OS.get_environment("MT_TEST_MODE") != "playable" or serverinfo == null:
+		return {}
+	if serverinfo.server(server_index).is_empty():
+		return {}
+	_sel_server = server_index
+	_sel_channel = channel
+	return serverinfo.address(_sel_server, _sel_channel)
+
 # Read-only adapter for the packaged playable test.  It deliberately returns
 # summaries rather than the private UI/game nodes so a report cannot retain a
 # stale scene reference across reconnect or map reload.
@@ -147,14 +164,16 @@ func _on_char_list(list: Array) -> void:
 	if auto_login and not _chars.is_empty():
 		var idx := int(_chars[0].get("index", 0))
 		if _auto_char_slot >= 0:
+			# An explicit MT_CHAR_SLOT that the account lacks must not silently enter
+			# another character; stay on the select screen instead.
+			idx = -1
 			for character in _chars:
 				if int(character.get("index", -1)) == _auto_char_slot:
 					idx = _auto_char_slot
 					break
-		if client.has_method("enter_game"):
-			client.enter_game(idx)
-		elif client.has_method("select_character"):
-			client.select_character(idx)
+		if idx >= 0:
+			# Remember the slot so a later in-game reconnect re-enters the same character.
+			_enter_character(idx)
 
 func _on_char_name_changed(pid: int, name: String) -> void:
 	var sc: Node = _ui.get_node_or_null("CharSelect") if _ui and _state == SELECT else null