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/netplay_test.gd

@@ -289,8 +289,15 @@ func _run() -> void:
 	var hook_calls: Array = []
 	np.use_skill_hook = func(slot: int) -> bool: hook_calls.append(slot); return true
 	pc.player.position = Vector3.ZERO
+	_ck(is_equal_approx(np.skill_target_distance_cm(4100), 3000.0), "skill_target_distance_cm = node distance in cm")
+	_ck(np.skill_target_distance_cm(424242) < 0.0, "skill_target_distance_cm unknown vid -> -1")
+	var ctx_distance: Callable = np.skill_context().get("target_distance", Callable())
+	_ck(ctx_distance.is_valid() and is_equal_approx(float(ctx_distance.call(4100)), 3000.0),
+			"skill_context exposes the same distance to the PlayerSkill gate")
+	_ck(not np.is_use_skill_reserved(5), "no reservation yet")
 	np.reserve_use_skill(4100, 5, 800.0)
 	_ck(is_equal_approx(np._skill_range_reserved, 790.0), "reserve_use_skill trims range >100 by 10")
+	_ck(np.is_use_skill_reserved(5) and not np.is_use_skill_reserved(6), "__IsReservedUseSkill matches the reserved slot")
 	pc.walk_calls.clear()
 	fc.calls.set_target.clear()
 	await process_frame