Root cause of PR checks stuck "Waiting to run": full-pytest on main ran
~12k tests including the slow registry on a 1.5-CPU / 1.2 GiB job cgroup
for hours, monopolizing the only runner.
Workflows:
- full-pytest.yml: fast lane only (`not quarantine and not slow`)
- nightly-full-pytest.yml: full suite including slow (schedule + manual)
- lane-shas.yml: PR path filters so pin verification is skipped when
the change cannot affect lane report bytes
Docs: docs/ci-optimization.md + testing-lanes CI mapping.
Infra (VM, same change window): job cgroup 2 CPU / 1800 MiB; hung
full-pytest task stopped so the queue can drain PR smoke/lane-shas.
