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

test/playable/scenario.example.json

@@ -4,7 +4,11 @@
   "protocol": "classic",
   "server": {
     "server_index": 0,
-    "channel_index": 0
+    "channel": 1,
+    "auth_host": "",
+    "auth_port": 0,
+    "game_host": "",
+    "game_port": 0
   },
   "character_slot": 0,
   "map_key": "",
@@ -14,6 +18,26 @@
   "skill_cases": [],
   "resolution": [1280, 720],
   "loops": 3,
-  "timeout_seconds": 120,
-  "notes": "Copy to a local ignored file and fill from the confirmed server fixture. Never add credentials here."
+  "timeout_seconds": 900,
+  "soak": {
+    "duration_seconds": 7200,
+    "rest_seconds": 30,
+    "warmup_rounds": 1,
+    "min_rounds": 10,
+    "reconnects": 10,
+    "exits": 10,
+    "resolutions": {
+      "sizes": [[1280, 720], [1440, 900], [1600, 1000]],
+      "switches_per_size": 10
+    },
+    "warp": {
+      "status": "unconfirmed",
+      "notes": "Set status=confirmed only after the environment owner verifies a legal portal: required (even, >=20 out-and-back legs), portal_cm, destination_map_key, return_portal_cm, cross_server."
+    },
+    "faults": {
+      "status": "unconfirmed",
+      "notes": "Set status=confirmed only with a confirmed 127.0.0.1 test proxy (mode local_proxy, per_type, unreachable_seconds 1..20, upstream {auth_host,auth_port,game_host,game_port} = the real test server). server.* and the serverlist entry must then be 127.0.0.1 proxy ports; script/run_client_gate.sh starts script/playable_fault_proxy.mjs for this client only. A server warp that hands out a direct game address bypasses the proxy. Never change global routes or firewall; active reconnect is not a substitute."
+    }
+  },
+  "notes": "Copy to test/playable/<name>.local.json (ignored) and fill from the confirmed server fixture: server.* must equal the serverinfo entry for server_index/channel; map_key is the asset directory holding Setting.txt; waypoints are server cm. Never add credentials here. The soak suite (STB-01) additionally needs timeout_seconds >= soak.duration_seconds + 900."
 }