Merge lane base check: develop 095fb86d9aca

Merge lane base check: run the full gate on `develop` at `095fb86d9acad875785fb442f26de62875411551` 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 095fb86d9aca certified green: full gate passed in 714s (61,247 tests, 0 failures); lane recorded the certificate. No PRs, nothing ejected. Memory: none applied.