Personas have walls their followers write on

Owner decision of 2026-10-06 (G-0009, FEP-400e). A persona's actor names its wall (…/graffiti, sm:wall) and, in
Smithereen's privacySettings, that its followers may write on it. A public post that is not a reply, sent with the wall
as its target by an account following the persona, is hosted: the persona is notified, it reaches the persona's and its
followers' homes, and the followers' servers and the author's are told with Add{Note}. The persona deletes it with
DELETE /api/v1/statuses/:id, which sends Remove{Note}; Smithereen deletes the post then. The wall lists the persona's
public posts that start a thread and what was written on it.

Elsewhere: an account's Add{Note} on its own wall shows the post to its followers here as on that wall (privapub.wall on
the status), and its Remove takes it away. An Add or Remove naming a collection of the account's own server PrivaPub
does not know has its document read again first, at most hourly: accounts kept before walls were read had none.

Checked live: Smithereen 40 checks (G-0009 closed); GoToSocial and Mastodon unchanged (121).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Federation/Rendering/ActivityPubRenderer.cs

@@ -72,7 +72,14 @@ namespace PrivaPub.Federation.Rendering
 				["value"] = "schema:value",
 				["webfinger"] = "https://purl.archive.org/socialweb/webfinger#webfinger",
 				["lemmy"] = "https://join-lemmy.org/ns#",
-				["postingRestrictedToMods"] = "lemmy:postingRestrictedToMods"
+				["postingRestrictedToMods"] = "lemmy:postingRestrictedToMods",
+				// Smithereen's, which it compacts what it reads by: an allowedTo stays a plain string, as it reads them
+				["sm"] = "http://smithereen.software/ns#",
+				["wall"] = new JsonObject { ["@id"] = "sm:wall", ["@type"] = "@id" },
+				["privacySettings"] = "sm:privacySettings",
+				["wallPosting"] = "sm:wallPosting",
+				["wallPostVisibility"] = "sm:wallPostVisibility",
+				["allowedTo"] = "sm:allowedTo"
 			});
 
 		public static string Html(string markdown) =>
@@ -128,6 +135,16 @@ namespace PrivaPub.Federation.Rendering
 					["value"] = FieldValue(field.Value)
 				}).ToArray())
 			};
+			// a persona's wall (FEP-400e, owner decision 2026-10-06): its followers write on it, everyone reads it
+			if (actor.HasWall)
+			{
+				document["wall"] = actor.Wall;
+				document["privacySettings"] = new JsonObject
+				{
+					["wallPosting"] = new JsonObject { ["allowedTo"] = new JsonArray(actor.Followers) },
+					["wallPostVisibility"] = new JsonObject { ["allowedTo"] = new JsonArray(Public) }
+				};
+			}
 			if (actor is { Kind: LocalActorKind.Group, IsCircle: false })
 			{
 				document["attributedTo"] = actor.Wardens;