Fix red develop 8a6fe994a870

The merge lane found `develop` red at `8a6fe994a870e8ac93b7a7779bc8abdee2ac96f6` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_workflow_registry.py::test_every_registered_workflow_is_catalogued_or_deliberately_excluded` - `api-unit-dc-test` The whole gate log: artifact `13693` on lane task 12255. Make `develop` pass its full gate again. Open a PR as usual: the merge lane merges a PR that fixes some of these and adds no failure even while `develop` is red.

Catalogued the deliver_removals (account-remove) workflow in workflow_registry.py; registry test 6/6 and quick gate green. PR #7599 queued to the merge lane. Memory: none applied.