Merge lane base check: develop 9fde00bb1518

Merge lane base check: run the full gate on `develop` at `9fde00bb1518abfc80f96822d4493f57adf41324` 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.

Base check develop 9fde00bb15: red. Full gate failed 1 vitest test, mutedText.test.ts "no Typography or Link computes a palette path into color" (1 offender); develop_red reported, fix task filed by CP. Memory: none applied