fix(transport): remove the never-read Transport:SchemaVersionMajor option (review 2026-10-21 04/U1, 08/O3)

src/ZB.MOM.WW.ScadaBridge.Host/appsettings.Central.json

@@ -84,8 +84,7 @@
       "MaxBundleSizeMb": 100,
       "MaxUnlockAttemptsPerSession": 3,
       "MaxUnlockAttemptsPerIpPerHour": 10,
-      "Pbkdf2Iterations": 600000,
-      "SchemaVersionMajor": 1
+      "Pbkdf2Iterations": 600000
     },
     "Logging": {
       "MinimumLevel": "Information"

src/ZB.MOM.WW.ScadaBridge.Transport/TransportOptions.cs

@@ -41,8 +41,6 @@ public sealed class TransportOptions
     public int MaxUnlockAttemptsPerIpPerHour { get; set; } = 10;
     /// <summary>Gets or sets the PBKDF2 iteration count used for passphrase key derivation.</summary>
     public int Pbkdf2Iterations { get; set; } = 600_000;
-    /// <summary>Gets or sets the major version of the bundle schema this instance produces and accepts.</summary>
-    public int SchemaVersionMajor { get; set; } = 1;
 
     /// <summary>
     /// Human-readable name of the cluster/environment producing bundles. Stamped

src/ZB.MOM.WW.ScadaBridge.Transport/TransportOptionsValidator.cs

@@ -60,10 +60,6 @@ public sealed class TransportOptionsValidator : OptionsValidatorBase<TransportOp
             $"ScadaBridge:Transport:Pbkdf2Iterations must be at least {MinPbkdf2Iterations:N0} " +
             $"(was {options.Pbkdf2Iterations}); a lower value silently weakens bundle key derivation.");
 
-        builder.RequireThat(options.SchemaVersionMajor > 0,
-            $"ScadaBridge:Transport:SchemaVersionMajor must be positive " +
-            $"(was {options.SchemaVersionMajor}); it is the major bundle-schema version this instance emits and accepts.");
-
         builder.RequireThat(!string.IsNullOrWhiteSpace(options.SourceEnvironment),
             "ScadaBridge:Transport:SourceEnvironment must be a non-empty name; it is stamped into " +
             "BundleManifest.SourceEnvironment and the export filename.");