Merge lane base check: develop f136e340b35a

Merge lane base check: run the full gate on `develop` at `f136e340b35aab19b4e38989473f09440448210a` 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 f136e340b red (gate 2×, develop_red reported): 2 TrialAgentsMeter vitest tests are a date time bomb — fixture pins NOW=2026-10-22, trial_end +9d, component uses real clock → 3d left shows warning copy. Fix: relative trial_end or fake timers. Memory: none applied.