Fix red develop 9c7b0f553efb

The merge lane found `develop` red at `9c7b0f553efb3c8f8d2e4a7a9e3a5d7f623e2a7d` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_host_platform_guard.py::test_no_host_specific_spelling_outside_the_seam_beyond_the_frozen_residual` - `jaahd-unit-pytest` The whole gate log: artifact `10013` on lane task 10079. 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.

develop red at 9c7b0f553 (host_platform guard residual drift) was already fixed by 41b795673 (Task 10040, PR #6926). Verified: the guard test and the full jaahd container suite pass at develop 0138f9202. No PR. Memory: none applied.