Revert "graccesscli: fail fast on package-only attribute writes (writeback gap fix)"

This reverts commit bd95ace1c5.

graccesscli/src/ZB.MOM.WW.GRAccess.Cli/GRAccess/GRAccessCommandDispatcher.cs

@@ -503,7 +503,6 @@ namespace ZB.MOM.WW.GRAccess.Cli.GRAccess
                     return AtomicObjectEdit(obj, editObj =>
                     {
                         var editAttr = FindAttributeForMutation(editObj, Arg(args, "attribute"));
-                        EnsureMutableViaSetValue(editAttr, Arg(args, "attribute"));
                         editAttr.SetValue(CreateMxValue(Arg(args, "value"), Arg(args, "data-type", "string")));
                         return CommandSummary(editAttr, "Set attribute value");
                     });
@@ -1624,40 +1623,11 @@ namespace ZB.MOM.WW.GRAccess.Cli.GRAccess
             }
 
             var attr = FindAttributeForMutation(obj, attributeName);
-            EnsureMutableViaSetValue(attr, attributeName);
             var body = File.ReadAllText(file);
             attr.SetValue(CreateMxValue(body, "string"));
             return CommandSummary(attr, $"Set script {attributeName}");
         }
 
-        // Checks whether `attr.SetValue` will actually persist on this attribute,
-        // or whether the attribute is package-only (in which case SetValue silently
-        // no-ops despite returning Successful=true). Discovered via investigation
-        // documented in the writeback-gap notes: ScriptExtension text fields
-        // (ExecuteText, DeclarationsText, StartupText, ShutdownText, OnScanText,
-        // OffScanText, Expression) are all `MxCategoryPackageOnly_Lockable` —
-        // editable only via the package import/export round-trip, never via the
-        // generic `IAttribute.SetValue` path. Same for any other attribute whose
-        // category starts with `MxCategoryPackageOnly`.
-        private static void EnsureMutableViaSetValue(IAttribute attr, string attributeName)
-        {
-            string category;
-            try { category = attr.AttributeCategory.ToString(); }
-            catch { return; } // best-effort; if we can't read the category, let the write proceed
-
-            if (category != null && category.StartsWith("MxCategoryPackageOnly", StringComparison.OrdinalIgnoreCase))
-            {
-                throw new InvalidOperationException(
-                    $"Attribute '{attributeName}' has category '{category}'. " +
-                    "Package-only attributes silently no-op via IAttribute.SetValue and can only be " +
-                    "edited through the package import/export round-trip. " +
-                    "For ScriptExtension bodies (ExecuteText / DeclarationsText / StartupText / etc.), " +
-                    "edit the source object in the System Platform IDE and re-import, " +
-                    "or use a future package-rewrite path. " +
-                    "See docs/script-parsing.md:8.");
-            }
-        }
-
         private static string ObjectScriptCreate(IGalaxy galaxy, IgObject obj, IDictionary<string, object> args)
         {
             var scriptName = Arg(args, "script");
@@ -1724,7 +1694,6 @@ namespace ZB.MOM.WW.GRAccess.Cli.GRAccess
             if (!string.IsNullOrWhiteSpace(expression))
             {
                 var attr = FindAttributeForMutation(obj, scriptName + ".Expression");
-                EnsureMutableViaSetValue(attr, scriptName + ".Expression");
                 attr.SetValue(CreateMxValue(expression, "string"));
                 yield return CommandSummary(attr, $"Set script {scriptName}.Expression");
             }