Merge lane base check: develop 4514b57daa55

Merge lane base check: run the full gate on `develop` at `4514b57daa557a54bd52071683ea811d2e144d08` alone and report it certified or red: nothing had certified it since the last attempt. A red verdict files a fix task; it never holds the lane. Filed by the control plane (`app/merge_lane.py::_certify_idle`). How: run `python3 tools/merge_lane.py run` once. It takes this check's batch, gates that commit with the full gate in its sandbox and reports `certified` or `develop_red` itself. Never run the gate by hand: a hand-run green reports nothing, so no certificate is recorded.

Base check 4514b57 develop_red: test_cross_org_isolation.py::test_every_path_parameter_is_swept_or_named fails, also when rerun alone. Lane reported it, so the CP files the fix. Queue empty. Memory: none applied