Merge lane base check: develop 2db428429aea

Merge lane base check: run the full gate on `develop` at `2db428429aead5f4ccb98f5ced6baa29543fdac1` 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 2db428429aea RED (reported develop_red, 2× reproducible): jaah-ce mirror findings — node_log_findings.py names non-CE paths (e84abd5e9, Task 11350); nodes/update.py imports app.vnodes (0ebe63630, Task 11357).