Merge lane base check: develop d274103329f4

Merge lane base check: run the full gate on `develop` at `d274103329f43b8cf411ebaa36811a146a71ffc7` 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 d274103329 RED: test_activity_kinds keep-list test fails — new unaudited record site orgs.py::delete_own_org#1 from PR #7189 (Task 10797); confirmed on focused rerun. Fix task #10809 filed. Memory: none applied