Three more LIVE end-to-end suites: test/livetls (HTTP/2 over TLS + Alt-Svc h3 + real HTTP/3-over-QUIC + no-TLS-http3 error), test/livereload (config hot-reload detected/rejected/honest-boundary live), test/liveload (500 concurrent requests with exact metric equality, in-flight quiesce, cache-under-load, 200 streams, 44k-request soak, zero errors). Plus a free-port retry so heavy port churn does not spuriously fail. Tests only; no gateway behavior change.