refactor(mocks): exclude transient KeepOutParamsInExtensionSignature …

…from model equality

The flag is computed ephemerally in Build() via ApplyOutDisambiguation
and is never true on models flowing through the incremental pipeline,
so it should not participate in model identity.

TUnit.Mocks.SourceGenerator/Models/MockMemberModel.cs

@@ -51,7 +51,10 @@ internal sealed record MockMemberModel : IEquatable<MockMemberModel>
     /// matchable-parameter signature (e.g. <c>BlobClient.GenerateSasUri(perms, expires)</c> vs
     /// <c>GenerateSasUri(perms, expires, out string stringToSign)</c>). When true, callers must
     /// pass <c>out _</c> at the call site for the disambiguated overload.
-    /// Computed across the full method set in <see cref="Builders.MockMembersBuilder"/>.
+    /// Computed transiently inside <see cref="Builders.MockMembersBuilder.Build"/> by examining
+    /// the full method set; never set on models flowing through the incremental pipeline.
+    /// Excluded from <see cref="Equals(MockMemberModel?)"/> / <see cref="GetHashCode"/> because
+    /// it is a derived per-build flag, not part of model identity.
     /// </summary>
     public bool KeepOutParamsInExtensionSignature { get; init; }
 
@@ -96,7 +99,6 @@ public bool Equals(MockMemberModel? other)
             && IsRefStructReturn == other.IsRefStructReturn
             && IsStaticAbstract == other.IsStaticAbstract
             && IsReturnTypeStaticAbstractInterface == other.IsReturnTypeStaticAbstractInterface
-            && KeepOutParamsInExtensionSignature == other.KeepOutParamsInExtensionSignature
             && SpanReturnElementType == other.SpanReturnElementType;
     }
 
@@ -111,7 +113,6 @@ public override int GetHashCode()
             hash = hash * 31 + Parameters.GetHashCode();
             hash = hash * 31 + IsStaticAbstract.GetHashCode();
             hash = hash * 31 + IsReturnTypeStaticAbstractInterface.GetHashCode();
-            hash = hash * 31 + KeepOutParamsInExtensionSignature.GetHashCode();
             hash = hash * 31 + (ExplicitInterfaceName?.GetHashCode() ?? 0);
             hash = hash * 31 + (DeclaringInterfaceName?.GetHashCode() ?? 0);
             return hash;