refactor(core): migrate to Bun and converge acquisition policies and Agent boundaries

packages/agent/test/runtime.test.ts

@@ -354,14 +354,10 @@ describe("PiAgentRuntime + FakeModelProvider", () => {
 
   it("JSONL 恢复:子进程在 download.submit 执行中被 SIGKILL,新进程 resume 得到“结果未知”且不重复提交", async () => {
     const sessionDir = await tempDir();
-    const child = spawn(
-      process.execPath,
-      ["run", "-A", join(import.meta.dirname!, "fixtures/crash-run.ts"), sessionDir],
-      {
-        cwd: join(import.meta.dirname!, ".."),
-        stdio: ["ignore", "pipe", "pipe"],
-      },
-    );
+    const child = spawn(process.execPath, [join(import.meta.dirname!, "fixtures/crash-run.ts"), sessionDir], {
+      cwd: join(import.meta.dirname!, ".."),
+      stdio: ["ignore", "pipe", "pipe"],
+    });
     let stderr = "";
     child.stderr.on("data", (d) => {
       stderr += String(d);

packages/agent/test/upstream.test.ts

@@ -150,14 +150,14 @@ describe("按上游装配", () => {
   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);
+    globalThis.fetch = (async (input: string | Request | URL, init?: RequestInit) => {
+      const req = new Request(input instanceof Request ? input : String(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;
+    }) as typeof globalThis.fetch;
     try {
       const c = new PiUpstreamClient(
         spec({ provider: "opencode-go", authKind: "api_key" }),