Three claims a green backend used to make, each slightly wider than the
truth — and #392 happened in exactly that gap.
The frontend pin said 20260826.1 next to homeassistant==2026.8.3, whose
package_constraints.txt requires 20260729.7: a combination that exists
in no HA release. It was never derived from anything — someone once
picked it. It is now taken from the constraints, the source is named in
the file, and a test holds both numbers together so raising HA cannot
quietly desync them.
ruff's include declared three trees while CI linted one. Narrowed the
declaration rather than widening CI: the debt in scripts/ and
tests_backend/ (56 findings, mostly E402/I001, plus 7 B023 and 5 B017)
has its own cost and its own decisions, and belongs in its own task, not
in a visibility fix. test/lint-scope.test.mjs now compares the two, so
they can only move together.
The pin check skipped a workflow when it found neither the package name
nor the requirements path — and both vanish together the moment someone
returns to Defaulting to user installation because normal site-packages is not writeable, i.e. the gate switched itself off
under precisely the change it exists to catch. It now walks the whole
.github/workflows directory and decides per file by a positive sign: if
a file installs python packages, it must install them from the pins
file. Verified by dropping a rogue workflow into the directory — it
reddens without touching any list.
Three mutants registered and each run by hand.
User-Visible: no
Issue: #399
