fix: cleanup stale resume cli processes

src/agents/cli-runner.test.ts

@@ -0,0 +1,56 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import { runCliAgent } from "./cli-runner.js";
+
+const runCommandWithTimeoutMock = vi.fn();
+const runExecMock = vi.fn();
+
+vi.mock("../process/exec.js", () => ({
+  runCommandWithTimeout: (...args: unknown[]) =>
+    runCommandWithTimeoutMock(...args),
+  runExec: (...args: unknown[]) => runExecMock(...args),
+}));
+
+describe("runCliAgent resume cleanup", () => {
+  beforeEach(() => {
+    runCommandWithTimeoutMock.mockReset();
+    runExecMock.mockReset();
+  });
+
+  it("kills stale resume processes for codex sessions", async () => {
+    runExecMock.mockResolvedValue({ stdout: "", stderr: "" });
+    runCommandWithTimeoutMock.mockResolvedValueOnce({
+      stdout: "ok",
+      stderr: "",
+      code: 0,
+      signal: null,
+      killed: false,
+    });
+
+    await runCliAgent({
+      sessionId: "s1",
+      sessionFile: "/tmp/session.jsonl",
+      workspaceDir: "/tmp",
+      prompt: "hi",
+      provider: "codex-cli",
+      model: "gpt-5.2-codex",
+      timeoutMs: 1_000,
+      runId: "run-1",
+      cliSessionId: "thread-123",
+    });
+
+    if (process.platform === "win32") {
+      expect(runExecMock).not.toHaveBeenCalled();
+      return;
+    }
+
+    expect(runExecMock).toHaveBeenCalledTimes(1);
+    const args = runExecMock.mock.calls[0] ?? [];
+    expect(args[0]).toBe("pkill");
+    const pkillArgs = args[1] as string[];
+    expect(pkillArgs[0]).toBe("-f");
+    expect(pkillArgs[1]).toContain("codex");
+    expect(pkillArgs[1]).toContain("resume");
+    expect(pkillArgs[1]).toContain("thread-123");
+  });
+});