- The background probe reported the host Stopped whenever a read pass held
_gate past the probe deadline: contention is the connection being used,
not lost. A contended tick now gives no verdict (counted for tests); a
real probe failure still reports Stopped. A tick that races a teardown no
longer reopens a connection on an uninitialised driver.
- S7DriverProbe deserialised S7DriverOptions directly, whose Timeout is a
TimeSpan no config names, so "timeoutMs" was ignored and every handshake
waited the whole Test Connect budget. The handshake and test read are now
bounded by timeoutMs, capped by the caller's timeout.
Refs #742
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty