Auto: s7-c5 — pre-flight PUT/GET enablement test

Closes #298

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

@@ -67,7 +67,15 @@ 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",
+                // PR-S7-C5 — explicit empty-string in JSON skips the probe entirely
+                // (sites without a fingerprint address); a missing field falls back to
+                // the MW0 convention so existing configs keep working unchanged.
+                ProbeAddress = dto.Probe is null
+                    ? "MW0"
+                    : (dto.Probe.ProbeAddress is null
+                        ? "MW0"
+                        : (string.IsNullOrWhiteSpace(dto.Probe.ProbeAddress) ? null : dto.Probe.ProbeAddress)),
+                SkipPreflight = dto.Probe?.SkipPreflight ?? false,
             },
             TsapMode = ParseEnum<TsapMode>(dto.TsapMode, driverInstanceId, "TsapMode",
                 fallback: TsapMode.Auto),
@@ -193,6 +201,22 @@ public static class S7DriverFactoryExtensions
         public bool? Enabled { get; init; }
         public int? IntervalMs { get; init; }
         public int? TimeoutMs { get; init; }
+
+        /// <summary>
+        ///     Address probed by the background liveness loop and (PR-S7-C5) by the
+        ///     post-<c>OpenAsync</c> pre-flight check. Default <c>MW0</c> when the
+        ///     <c>Probe</c> object is omitted entirely; explicit <c>null</c> /
+        ///     whitespace skips both the background probe and the pre-flight read.
+        /// </summary>
         public string? ProbeAddress { get; init; }
+
+        /// <summary>
+        ///     PR-S7-C5 — opt out of the pre-flight PUT/GET enablement read at
+        ///     <see cref="S7Driver.InitializeAsync"/> time. Default <c>false</c> =
+        ///     pre-flight runs and a hardened CPU with PUT/GET disabled fails Init
+        ///     with <see cref="S7PutGetDisabledException"/>. See
+        ///     <c>docs/v2/s7.md</c> "Pre-flight PUT/GET enablement" section.
+        /// </summary>
+        public bool? SkipPreflight { get; init; }
     }
 }