feat(process): support env overrides in exec

src/process/exec.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+
+import { runCommandWithTimeout } from "./exec.js";
+
+describe("runCommandWithTimeout", () => {
+  it("passes env overrides to child", async () => {
+    const result = await runCommandWithTimeout(
+      [
+        process.execPath,
+        "-e",
+        'process.stdout.write(process.env.CLAWDIS_TEST_ENV ?? "")',
+      ],
+      {
+        timeoutMs: 5_000,
+        env: { CLAWDIS_TEST_ENV: "ok" },
+      },
+    );
+
+    expect(result.code).toBe(0);
+    expect(result.stdout).toBe("ok");
+  });
+});