Merge lane base check: develop 82cdf308d64c

Merge lane base check: run the full gate on `develop` at `82cdf308d64ccd9b44ed9c412d458e4c96c45409` 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 82cdf308 red (full gate 2×, reported develop_red): vitest AutomationEditPage create-project-link draft prompt; api test_support_console_reader marked-read activity row. No PRs ejected; queue empty.