Merge lane base check: develop 54889c6dd55c

Merge lane base check: run the full gate on `develop` at `54889c6dd55c7177175ef3548a41d436a589b1e9` 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.

develop 54889c6 red: 2 'Task 10933' refs in mirrored orgs.py (from #7216) failed mirror-sensitive/CE suites. Fixed forward in #7217, merged cf576942; deploy green. Memory: none applied