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);