fix(driver-s7): resolve Medium code-review finding (Driver.S7-012)

Remove the dead ProbeAddress config surface from S7ProbeOptions and the factory
DTO. ProbeLoopAsync uses Plc.ReadStatusAsync (CPU-status PDU), not a tag-address
read — ProbeAddress was never consumed. The XML doc on Probe is corrected to
describe the ReadStatusAsync-based probe. Existing configs that set probeAddress
are silently ignored by the JSON deserializer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7/S7DriverFactoryExtensions.cs

@@ -64,7 +64,7 @@ public static class S7DriverFactoryExtensions
                 Enabled = dto.Probe?.Enabled ?? true,
                 Interval = TimeSpan.FromMilliseconds(dto.Probe?.IntervalMs ?? 5_000),
                 Timeout = TimeSpan.FromMilliseconds(dto.Probe?.TimeoutMs ?? 2_000),
-                ProbeAddress = dto.Probe?.ProbeAddress ?? "MW0",
+                // Driver.S7-012: ProbeAddress removed — probe uses ReadStatusAsync, not a tag read.
             },
         };
     }
@@ -131,6 +131,8 @@ public static class S7DriverFactoryExtensions
         public bool? Enabled { get; init; }
         public int? IntervalMs { get; init; }
         public int? TimeoutMs { get; init; }
-        public string? ProbeAddress { get; init; }
+        // Driver.S7-012: ProbeAddress removed from the configurable surface — the probe uses
+        // ReadStatusAsync (CPU status), not a tag-address read. Config documents that previously
+        // set probeAddress are safely ignored (unknown JSON fields are tolerated by the deserialiser).
     }
 }