Merge lane base check: develop dd94f0b8e717

Merge lane base check: run the full gate on `develop` at `dd94f0b8e717c00e30454bb284d7be606955f4ef` 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 (Task 6722).

Base check certified develop dd94f0b8e717: full gate green in 666s (56,636 passed, 0 failed), tree 564b24a. Nothing to merge or eject; queue empty, develop green. Memory: none applied.