Ln 782 Test Runner

Runs your test suites after bootstrap and tells you what passed, failed, or broke. Auto-detects frameworks like Vitest, Jest, pytest, xUnit, go test, and cargo test, executes them with compact flags, then parses results into structured counts and optional coverage. The Monitor integration is smart: streams failures in real time for long-running suites so you can react before everything finishes. Honest take: this is glue code done right. It knows the difference between "no tests found" and "tests exploded," respects timeouts, and actually parses output instead of trusting exit codes. If you're wiring up CI or verifying a fresh project scaffold, this handles the boring detection and reporting work.