Dispatches mobile UI test runs across a 3-tier device matrix (smoke per-PR, regression per-merge, full farm at release) to control CI cost: generates per-target Appium capability configs from a central YAML, parallelises via GitHub Actions matrix strategy, and aggregates JUnit XML into a cross-device pass/fail table. Use when the question is about which devices to run and when, not about how to configure a specific test framework (for that, use xcuitest-suite, espresso-suite, etc.).