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/test/integration/cph.test.ts

@@ -1,8 +1,8 @@
-import { describe, it, expect, beforeEach } from "vitest";
-import { mkdtemp, rm, writeFile, mkdir } from "node:fs/promises";
+import { describe, it, expect, beforeEach, afterEach } from "vitest";
+import { cp, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { ToolRegistry } from "../../src/agent/tools.js";
+import { ToolRegistry, type ToolContext } from "../../src/agent/tools.js";
 import { cphCheckTool, cphBuildTool } from "../../src/agent/cph.js";
 
 const EXAMPLES_DIR = join(process.cwd(), "..", "examples", "TH-141");
@@ -12,16 +12,21 @@ describe("cph subprocess tools (integration, real cph binary)", () => {
   let tools: ToolRegistry;
 
   beforeEach(async () => {
-    // Use the real TH-141 example as the workspace.
-    ws = EXAMPLES_DIR;
+    // Use a writable copy of the real TH-141 example as the workspace.
+    ws = await mkdtemp(join(tmpdir(), "hub-cph-example-"));
+    await cp(EXAMPLES_DIR, ws, { recursive: true });
     tools = new ToolRegistry();
-    tools.register(cphCheckTool());
-    tools.register(cphBuildTool());
+    tools.register("cph_check", cphCheckTool);
+    tools.register("cph_build", cphBuildTool);
+  });
+
+  afterEach(async () => {
+    await rm(ws, { recursive: true, force: true });
   });
 
   it("cph_check runs on the TH-141 example and returns diagnostics", async () => {
     const ctx = { runId: "r", projectId: "p", boundChatId: "c", workspaceDir: ws };
-    const out = await tools.execute("cph_check", {}, ctx);
+    const out = await executeTool(tools, "cph_check", {}, ctx);
     const result = JSON.parse(out) as { exitCode: number; stdout: string; stderr: string };
 
     // cph check exits 0 on a legal lesson (no error diagnostics, ADR-0010).
@@ -31,7 +36,7 @@ describe("cph subprocess tools (integration, real cph binary)", () => {
 
   it("cph_build renders the student target PDF", async () => {
     const ctx = { runId: "r", projectId: "p", boundChatId: "c", workspaceDir: ws };
-    const out = await tools.execute("cph_build", { target: "student", output: "build/test-student.pdf" }, ctx);
+    const out = await executeTool(tools, "cph_build", { target: "student", output: "build/test-student.pdf" }, ctx);
     const result = JSON.parse(out) as { exitCode: number; stdout: string; stderr: string; output: string };
 
     expect(result.exitCode).toBe(0);
@@ -41,7 +46,7 @@ describe("cph subprocess tools (integration, real cph binary)", () => {
     const empty = await mkdtemp(join(tmpdir(), "hub-cph-empty-"));
     try {
       const ctx = { runId: "r", projectId: "p", boundChatId: "c", workspaceDir: empty };
-      const out = await tools.execute("cph_check", {}, ctx);
+      const out = await executeTool(tools, "cph_check", {}, ctx);
       const result = JSON.parse(out) as { exitCode: number };
       expect(result.exitCode).not.toBe(0);
     } finally {
@@ -49,3 +54,11 @@ describe("cph subprocess tools (integration, real cph binary)", () => {
     }
   }, 15000);
 });
+
+async function executeTool(tools: ToolRegistry, name: string, args: unknown, ctx: ToolContext): Promise<string> {
+  const def = tools.build(ctx)[name];
+  if (def?.execute === undefined) {
+    throw new Error(`missing executable tool: ${name}`);
+  }
+  return def.execute(args, { toolCallId: "call", messages: [], context: undefined }) as Promise<string>;
+}