v0.6.0

• add test/services/arrserver: the servers a Sonarr, Radarr or Prowlarr calls home to, as a handler for a live suite to put behind its proxy: the update server, which is asked once a build is two weeks old, and the clock, whose recorded answer is wrong the next day; prowlarr-mcp's, brought over
• add test/services/newznab: Newznab and Torznab indexers for a live suite to run beside the server under test, any number on one listener, each usenet or torrent, with a catalogue the test changes as it goes and failures it sets; a release says its title and category, and the date and the torrent size it does not say are picked from a spread by a seed that can be given again, so no test leans on one made-up value; the three indexers of sonarr-mcp, radarr-mcp and prowlarr-mcp made one
• add test/services/sabnzbd: a SABnzbd for a live suite to run beside the server under test, a download client that downloads nothing and whose jobs the test progresses, pauses, completes with the files it names, or fails; sonarr-mcp's, brought over
• mcp/registry (breaking): Hints.OpenWorld is Hints.SendsOut, and it is for a tool that itself sends something to a person or a service beyond the server, an email or a notification; a tool that makes the server fetch from its own providers or hand work to its own download client is not one
• mcp/acctest: DecimalOr0 reads a fraction that may be absent, 0 when it is, beside NumOr0, which reads 1.5 as 1
• test/replayproxy: Serve takes a host and a path ("clock.example.org/v1/time") to answer that one path from the test while the host's other paths replay: a recorded time of day is wrong from the next day on
• test/env: ListenProxy brings the proxy up without asking the container anything, for a server that calls out as it starts and so is started only once the proxy listens; StartProxy is ListenProxy and then the check
• test/env (breaking): CheckReachable(ctx, what, port) replaces CheckProxyReachable(ctx, port) and names what could not be reached, so a suite can check the port of each service it runs as well as the proxy's
• test/env: the check probes the name the server was given for the host, APP_TEST_HOST (Host), where it probed host.docker.internal whatever the test script had told the container