Detect flaky tests from CI history and propose LLM-validated fixes via quarantine pull requests. Use when Claude needs to find flaky tests, analyze CI test stability, identify tests that flip pass/fail without code changes, or set up automated quarantine workflows. Supports any test framework that emits JUnit XML (pytest, unittest, JUnit, TestNG, Vitest, Jest with junit reporter). Trigger when users mention "flaky tests", "intermittent failures", "tests that randomly fail", "quarantine flaky tests", "CI flakiness", or ask to "find unreliable tests", "analyze CI history", "mark tests as flaky".