Fix red develop 1f6a72d1d949

The merge lane found `develop` red at `1f6a72d1d9490d5bb4ff5e0c94131c55fd90ef5a` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_production_qa_deployments.py::test_an_anchor_whose_push_arrives_late_is_not_a_rollback` - `api-unit-dc-test` The whole gate log: artifact `14253` on lane task 12615. 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.

The red develop was a test date time-bomb: delivery received_at used the wall clock while the module clock was frozen at 2026-11-01. The test now stamps received_at from the test clock. Production QA suite 352/352 and quick gate green. PR #7723 queued to the lane. Memory: none applied.