- Extracted the chromiumCanLaunch probe from browser-tab-evaluate into a
shared test/tools/chromium-probe.ts helper.
- The two attached-navigation tests from PR #7006 launch real headless
Chrome; CI runners without Chrome system libraries (libnspr4 & co.)
cannot exec the downloaded binary, failing the native/unit bucket.
- Gave both tests 30s timeouts to survive CI cold starts.