Fix red develop 4509165e55be

The merge lane found `develop` red at `4509165e55be0fec9ade2325bb4ca15797146e51` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_doctrine_bundle.py::test_cloud_prompts_are_byte_identical_to_the_pre_seam_golden` - `tests/test_read_relay.py::test_a_write_is_replayed_with_its_method_body_and_the_sockets_own_session` - `api-unit-dc-test` The whole gate log: artifact `14124` on lane task 12518. 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.

Fixed red develop: re-baselined the doctrine golden (4 merge-lane hashes from 8be6fb3c8e) and pinned logged_in_client's session cookie to testserver.local so the 15-min re-mint replaces it (CookieConflict). Quick gate green; PR #7705 queued.