tests/test_config_flow_real_ha.py skips itself at import time when homeassistant is
absent, and a skipped file is indistinguishable from a passing one: the stub jobs
end in "N passed, 1 skipped" and exit 0, and the drift sweep never reads it. That is
how three real-HA-only facts stayed hidden while five gates were green.
New real-ha-config-flow job installs the real stack on Home Assistant's interpreter
floor (reusing HOMEASSISTANT_PYTHON_FLOOR from tests/ha_api_drift.py), runs the file
with -rs, and then checks the pytest summary line itself: it must report passed tests
and no skipped/failed/error line, because some pytest versions exit 0 for a file that
skipped itself. The header comment now names both jobs that install Home Assistant.
engineer
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