Merge lane base check: develop 4a8614edaede

Merge lane base check: run the full gate on `develop` at `4a8614edaede8b86a2132dea8f900e1a9dbc5d40` 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 4a8614edaede reported develop_red: test_nodes_route cloud payload gained break_glass_warning (0908530dad, Task 12387); test_org_approval/test_terms_gate setup errors, fixture connected_world not found. Queue empty. Memory: none applied