Merge lane base check: develop a9d747fab81b

Merge lane base check: run the full gate on `develop` at `a9d747fab81bdb188f28da50ac8e5963382fe753` 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 a9d747fab81b: RED (reported develop_red). org-transfer-rule-tables fails: new table project_mcp_links.project_id→projects has no transfer rule (likely 83648d74c3, Task 13363). Memory: none applied.