refactor(hub): 手搓 agent loop 换成 Vercel AI SDK

将 provider/runner/tools 三件手搓轮子替换为 AI SDK v7 的 generateText + tool:
- 删 openrouter-provider.ts(翻译层消失)、provider.ts 自定义消息类型
- runner.ts 循环体改为 generateText({stopWhen: stepCountIs}),保留 RunRequest/RunResult 公共签名
- tools.ts ToolRegistry 改为 ToolFactory + build(ctx, names?) 按 role 白名单构建 tools record
- workspace/cph/feishu 工具改写为 tool() 定义,execute 闭包捕获 per-run ToolContext
- transcript.ts 改为 ModelMessage[] JSONL(0.0.0 cutover,无迁移)
- server.ts/trigger.ts 接 modelFactory + toolWhitelist
- 测试:helpers 写 MockLanguageModel implements LanguageModelV4;5 个测试改写 + 新增 runner.test.ts
- 移除未使用的 openai 依赖
- ADR-0017 Consequences 同步:loop 委托给 AI SDK,provider seam 是 LanguageModel

tsc 干净,54 tests 全过。

hub/src/server.ts

@@ -2,8 +2,8 @@
  * Hub entry — Fastify server + Feishu WebSocket listener.
  *
  * Wires the full trigger path: lark ws receives `im.message.receive_v1` →
- * trigger handler resolves chat→project (ADR-0001), creates AgentRun + acquires
- * the project lock (ADR-0002), runs the provider-agnostic agent loop
+ * trigger handler resolves chat->project (ADR-0001), creates AgentRun + acquires
+ * the project lock (ADR-0002), runs the AI SDK-backed agent runner
  * (ADR-0017), and releases the lock on finish. Feishu context reads inside the
  * loop are ADR-0003-authorized (chat must match binding).
  *
@@ -13,7 +13,7 @@
 import "dotenv/config";
 import Fastify from "fastify";
 import { prisma } from "./db.js";
-import { OpenRouterProvider } from "./agent/openrouter-provider.js";
+import { createModelFactory } from "./agent/provider.js";
 import { InMemoryModelRegistry } from "./agent/models.js";
 import { ToolRegistry, feishuContextTool } from "./agent/tools.js";
 import { readFileTool, writeFileTool, listFilesTool } from "./agent/workspace.js";
@@ -34,7 +34,7 @@ function requireEnv(name: string): string {
 async function main(): Promise<void> {
   const databaseUrl = requireEnv("DATABASE_URL");
   void databaseUrl; // prisma reads DATABASE_URL from env directly
-  const openrouterKey = requireEnv("OPENROUTER_API_KEY");
+  requireEnv("OPENROUTER_API_KEY");
   const feishuAppId = requireEnv("FEISHU_APP_ID");
   const feishuAppSecret = requireEnv("FEISHU_APP_SECRET");
   const feishuBotOpenId = requireEnv("FEISHU_BOT_OPEN_ID");
@@ -45,7 +45,7 @@ async function main(): Promise<void> {
   app.get("/api/healthz", async () => ({ ok: true, ts: Date.now() }));
 
   // --- Agent seam wiring ---
-  const provider = new OpenRouterProvider({ apiKey: openrouterKey });
+  const modelFactory = createModelFactory();
   const models = new InMemoryModelRegistry(
     [
       { id: "z-ai/glm-4.6", label: "GLM-4.6", toolCapable: true },
@@ -79,17 +79,17 @@ async function main(): Promise<void> {
   const tools = new ToolRegistry();
   // ADR-0003: the handler enforces chat==boundChat before any API call;
   // real read wraps @larksuiteoapi/node-sdk's im.v1.message get/list.
-  tools.register(feishuContextTool(readFeishuContext, feishuRt));
+  tools.register("feishu_read_context", feishuContextTool(readFeishuContext, feishuRt));
   // Workspace file tools (ADR-0007 directory tree, path-confined).
-  tools.register(readFileTool());
-  tools.register(writeFileTool());
-  tools.register(listFilesTool());
+  tools.register("read_file", readFileTool);
+  tools.register("write_file", writeFileTool);
+  tools.register("list_files", listFilesTool);
   // cph CLI tools (ADR-0016 version contract enforced by cph itself).
-  tools.register(cphCheckTool());
-  tools.register(cphBuildTool());
+  tools.register("cph_check", cphCheckTool);
+  tools.register("cph_build", cphBuildTool);
 
   // --- Feishu listener (reuses the same lark client) ---
-  const trigger = makeTriggerHandler({ prisma, provider, tools, models, logger: app.log });
+  const trigger = makeTriggerHandler({ prisma, modelFactory, tools, models, logger: app.log });
   startFeishuListenerWithClient(feishuConfig, larkClient, app.log, trigger);
 
   app.listen({ port, host: "0.0.0.0" }, (err, address) => {