flaky tests

Calculate the pipeline critical path, separate runner queues from execution, and improve feedback time without hiding flaky or skipped checks.

Testing is a pipeline design problem in this role, not a QA one. The constraint is the question: you cannot run everything on every commit, so what you choose to defer is the answer.

Quarantine is a holding cell with an expiry date, not a landfill. Per-test flake rates, entry evidence, an enforced expiry review, and the cap that turns fixing into priority.