scripts/dump_desktop_slash_registry.py --check exits 1 (no write) when the
committed apps/desktop/src/lib/desktop-slash-registry.json differs from
desktop_surface_registry(); the docstring now cites the test that actually
fails (test_desktop_slash_registry.py, not test_commands.py). The pytest
runs --check as a subprocess (green on the committed file) and calls
check() on a hand-edited copy (red).
scripts/ci/classify_changes.py: _PY_SKIP includes apps/, so an apps-only
edit of that JSON (or apps/shared/src/gateway-events.json) skipped the
Python lane and the only equality check never ran in CI. A table of
cross-language contract files now forces python:true; two classifier rows
pin it.