Add SessionFs sqlite support for runtime sqlite routing

dotnet/src/SessionFsProvider.cs

@@ -213,4 +213,11 @@ private static SessionFsError ToSessionFsError(Exception ex)
             : SessionFsErrorCode.UNKNOWN;
         return new SessionFsError { Code = code, Message = ex.Message };
     }
+
+    // SQLite support is not yet implemented for the .NET SDK.
+    // This satisfies the generated interface; full implementation will follow.
+    Task<SessionFsSqliteResult> ISessionFsHandler.SqliteAsync(SessionFsSqliteRequest request, CancellationToken cancellationToken)
+    {
+        throw new NotImplementedException("SQLite is not yet supported by the .NET SDK.");
+    }
 }