Fix red develop 98d9651d730d

The merge lane found `develop` red at `98d9651d730de9ea4903cd40c9bd4e4ea381b298` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_loop_debug.py::test_a_deliberately_slow_callback_is_logged_by_name_without_its_arguments` - `tests/test_loop_debug.py::test_a_plain_callback_and_a_timer_are_timed_without_their_arguments` - `tests/test_loop_debug.py::test_a_fast_loop_logs_nothing` - `api-unit-dc-test` The whole gate log: artifact `14527` on lane task 12820. 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 the 3 red loop_debug tests: they now count only WARNING records, so configure()'s INFO "logging on" line no longer leaks in when an earlier test left logging at INFO. Reproduced the failure, now 4/4 pass; quick gate green; PR #7773 queued to the merge lane. No UI surface affected. Memory: none applied.