Merge lane base check: develop 5e262101e561

Merge lane base check: run the full gate on `develop` at `5e262101e561ec5a6f9f18b44a07881494443c66` 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 5e262101e561 reported develop_red: Community edition tooling suite fails 2 tests deterministically (stage_bundle → edition_map can't find packages/editions/features.toml, resolves to /tmp). Fix task is filed by the CP. Memory: none applied