Merge lane base check: develop 1d469eedfb1b

Merge lane base check: run the full gate on `develop` at `1d469eedfb1b4220b3097d805c74292b093fc935` 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 (Task 6722).

Base check develop 1d469eedfb1b: develop_red reported by merge_lane.py run. Deterministic fail: e2e/access-principal.spec.ts:118 (Access tab locator matches 2 tabs, strict mode). org-indicator.spec.ts:232 flaky. Nothing merged; fix task filed by CP. Memory: none applied