Stable model and extension SPIs (isolation strategy, retry policy, failure classifier, report writer) plus the controller/fork IPC contract. Zero external dependencies so it can live safely on the forked test classpath.

Controller engine: discovery orchestration, execution journal, scheduler, fork lifecycle supervisor, IPC server, retry/escalation engine, isolation strategies, and report serialization.

Lightweight worker launched inside each forked JVM. Discovers/executes tests via the JUnit Platform Launcher and streams events plus heartbeats back to the controller over a loopback socket.

Reactor-terminal JaCoCo aggregate report and coverage gate (95% line / 90% branch).

Maven plugin entry point. Binds fault-tolerant Phoenixfire test execution to the test, integration-test, and verify lifecycle phases as an opt-in replacement for Surefire/Failsafe.