Merge lane base check: develop 985ffcb5c6af

Merge lane base check: run the full gate on `develop` at `985ffcb5c6af1c14ef13d8cf2fe4ef28cf59bcec` 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 985ffcb5c6af red: full gate 62914 passed, 9 failed (vitest muted-text colour; jaahd agent_vocabulary; api wire-contract, console places, dispatch folder prompt, task columns, settle matrix). develop_red reported; fix task filed by CP. Memory: none applied