Merge lane base check: develop 059cd0010916

Merge lane base check: run the full gate on `develop` at `059cd0010916a534be0335c9c1fb7df66e5e874f` 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`).

develop 059cd0010 red (3 mypy violations + test_entity_shape onupdate[Org] from Task 8061 FK cascade). Fixed forward, type/test-only, PR #6311 merged 5da655af8; full gate pass 689s. Deploy superseded by newer develop, left alone.