fix(pi): upstream completion test sends a sessionId (OpenCode x-opencode-session)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/agent/test/upstream.test.ts

@@ -133,6 +133,31 @@ describe("按上游装配", () => {
     expect(t).toMatchObject({ model: "claude-future-9", inCatalog: false, source: "stored credential" });
   });
 
+  it("测试补全带 sessionId:OpenCode Go 请求头有 x-opencode-session", async () => {
+    const seen: { url: string; headers: Headers }[] = [];
+    const orig = globalThis.fetch;
+    globalThis.fetch = (async (input: RequestInfo | URL, init?: RequestInit) => {
+      const req = new Request(input, init);
+      seen.push({ url: req.url, headers: req.headers });
+      return new Response(JSON.stringify({ error: { message: "stubbed" } }), {
+        status: 500,
+        headers: { "content-type": "application/json" },
+      });
+    }) as typeof fetch;
+    try {
+      const c = new PiUpstreamClient(
+        spec({ provider: "opencode-go", authKind: "api_key" }),
+        memStore({ type: "api_key", key: "sk-opencode-test" }),
+      );
+      await expect(c.test({ mode: "completion" })).rejects.toBeInstanceOf(UpstreamError);
+    } finally {
+      globalThis.fetch = orig;
+    }
+    const call = seen.find((x) => x.headers.get("x-opencode-session"));
+    expect(call, `请求:${seen.map((x) => x.url).join(", ")}`).toBeDefined();
+    expect(call?.headers.get("x-opencode-session")).toMatch(/^umt-upstream-test-/);
+  });
+
   it("自定义兼容端点:baseUrl/模型必填;authKind none 不需要 key", async () => {
     expect(() => new PiUpstreamClient(spec({ provider: "openai-compatible", authKind: "none" }), memStore())).toThrow(
       UpstreamError,