Wire-level tracing enabled by --debug (see FakeRiak.CLI).

Prints raw bytes moving in either direction on a connection, plus how the active protocol handler and the TLS layer interpreted them, straight to stderr. This is deliberately far noisier than --verbose request logging and exists for diagnosing failures that happen below the request level — a bad framing assumption, a client speaking a protocol variant fake_riak doesn't expect, or a TLS handshake that fails before there is a request to log at all (e.g. a client reporting nothing more specific than a closed connection).