Community actors name their moderators the way Lemmy reads them

attributedTo points at /wardens and postingRestrictedToMods reflects the
posting policy.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

PrivaPub/Federation/Rendering/ActivityPubRenderer.cs

@@ -97,6 +97,11 @@ namespace PrivaPub.Federation.Rendering
 					["value"] = FieldValue(field.Value)
 				}).ToArray())
 			};
+			if (actor is { Kind: LocalActorKind.Group, IsCircle: false })
+			{
+				document["attributedTo"] = actor.Wardens;
+				document["postingRestrictedToMods"] = actor.PostingRestrictedToModerators;
+			}
 			if (!string.IsNullOrEmpty(actor.PictureURL))
 				document["icon"] = new JsonObject { ["type"] = "Image", ["url"] = actor.PictureURL };
 			if (!string.IsNullOrEmpty(actor.ThumbnailURL))