## Summary
This PR runs Ruff's complete PGO pipeline in CI when release-build
inputs change, catching failures before they reach a release without
running on ordinary code changes.
The new `--debug` flag performs the same instrumented build, linting and
formatting workloads, profile merging, and profile-guided rebuild
without the cost of release optimization. The optional job follows the
existing release-build path filters, uses an eight-core runner, and
respects the `no-build` label.
Charlie Marsh
73d3b6f8c1