feat: upgrade investigation and presentation runtime

src/config.ts

@@ -1,4 +1,6 @@
 import dotenv from "dotenv";
+import { createHash } from "node:crypto";
+import { hostname } from "node:os";
 import { z } from "zod";
 
 import { loadAgentModelConfig, type AgentModelConfig } from "./chat/modelConfig.js";
@@ -7,6 +9,11 @@ import { DEFAULT_SESSION_WORKSPACE_ROOT } from "./runtime/conversationWorkspace.
 // 本地开发可在项目根目录放 .local.env；已存在的系统环境变量优先级更高。
 dotenv.config({ path: ".local.env", override: false });
 
+const defaultAgentInstanceId = `agent-${createHash("sha256")
+  .update(`${hostname()}\0${process.cwd()}\0${process.env.PORT ?? "8787"}`)
+  .digest("hex")
+  .slice(0, 24)}`;
+
 const optionalString = () =>
   z.preprocess(
     (value) => {
@@ -43,6 +50,8 @@ const envSchema = z
     PORT: z.coerce.number().int().positive().default(8787),
     // HTTP 服务监听地址。
     HOST: z.string().default("127.0.0.1"),
+    // Stable owner identity for durable task sessions. Set explicitly in replicated deployments.
+    AGENT_INSTANCE_ID: z.string().trim().min(1).max(128).default(defaultAgentInstanceId),
     // Product Server base URL used to verify browser identity and project scope.
     TJWATER_SERVER_BASE_URL: z.string().url().default("http://127.0.0.1:8000"),
     // 工况任务调用 Server 的最长等待时间，必须短于两次租约心跳之间的间隔。