test(ab): default AB matrices to one profile when unset; PLC-5/status-bit refusal fixture tests (#594, #593)

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/TransportMatrix.cs

@@ -9,7 +9,10 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests;
 ///     Every AbCip compose profile binds host <c>:44818</c>, so only one can run at a time. When
 ///     <c>AB_SERVER_COMPOSE_PROFILE</c> is set, <see cref="Profiles"/> keeps only that profile, so the
 ///     rows match the running container instead of driving, say, Micro800 semantics at a ControlLogix.
-///     Unset, every profile is crossed (the original behaviour).
+///     Unset, only the default ControlLogix profile is crossed: ab_server does not self-identify its
+///     <c>--plc</c> mode, so crossing every family at whichever container holds <c>:44818</c> failed the
+///     non-matching rows instead of skipping them. Set <c>AB_SERVER_COMPOSE_PROFILE</c> to the running
+///     profile (<c>compactlogix</c> / <c>micro800</c> / <c>guardlogix</c>) to select another family.
 /// </remarks>
 public static class TransportMatrix
 {
@@ -24,8 +27,9 @@ public static class TransportMatrix
         {
             var only = Environment.GetEnvironmentVariable("AB_SERVER_COMPOSE_PROFILE");
             return from p in KnownProfiles.All
-                   where string.IsNullOrEmpty(only) ||
-                         string.Equals(p.ComposeProfile, only, StringComparison.OrdinalIgnoreCase)
+                   where string.Equals(p.ComposeProfile,
+                       string.IsNullOrEmpty(only) ? KnownProfiles.ControlLogix.ComposeProfile : only,
+                       StringComparison.OrdinalIgnoreCase)
                    from t in AllTransports
                    select new object[] { p, t };
         }