Merge lane base check: develop d82a8bfac7ad

Merge lane base check: run the full gate on `develop` at `d82a8bfac7ad1df576d42cf92ff66c538dd0a5d2` 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 d82a8bfac7 red: e2e/hosts-billing.spec.ts:121 and :151 fail deterministically (hosts-list/host-origin not found); likely b7302d7882 Directory tabs restructure. develop_red reported by the lane. Memory: none applied.