pytest-xdist is gone: run_tests.sh no longer dispatches on host, the
Windows xdist (--dist loadfile) arm is deleted, and pytest-xdist is
dropped from the dev extra (uv lock removes it + execnet). The
per-file subprocess runner (run_tests_parallel.py) is THE runner on
every host — the shape the CI linux lane already used.
- tests-os.yml: the macOS/Windows lanes now run scripts/run_tests.sh
like every other lane, passing the marker-narrowed file list via
--files and -m after --. The runner natively tolerates per-file
empty collections (exit 5, platform-gated file) and fails the run
when NOTHING collected — replacing the hand-rolled exit-5 branch.
- tests/gateway/conftest.py: the hasattr(config, 'workerinput')
controller-guard was xdist-only dead code; the file-locked cache
already handled the per-file model. Removed.
- tests/tools/test_browser_supervisor.py: the port came from xdist's
worker_id (fixed 9225 under per-file isolation — concurrent files
collide). Binds an ephemeral port instead (bind 0, read back).
- ~35 comment sites named xdist as the isolation mechanism; they now
describe the shared-process hazard they actually guard against
(bare pytest runs, same-file ordering) without naming a runner that
no longer exists.
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