A post on a wall says whose, and the persona takes posts off its own

PrivaPub hosts what a persona's followers write on its wall (Smithereen's, FEP-400e) and shows posts written on walls
elsewhere to their owners' followers. A card names the wall (privapub.wall, data-wall, linking the profile), and one
written on the persona's own wall is taken off from the card's menu, which PrivaPub tells as a Remove and Smithereen
applies as a deletion. WallTests checks it against Smithereen.

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

Models/Mastodon/PrivaPubStatus.cs

@@ -21,6 +21,8 @@ public class PrivaPubStatus
 	/// <summary>A remote post's own place (Pixelfed's location), shown only.</summary>
 	public PrivaPubPlace Place { get; set; }
 	public PrivaPubVotes Votes { get; set; }
+	/// <summary>Whose wall it was written on (Smithereen's walls, FEP-400e), when not its author's own.</summary>
+	public Account Wall { get; set; }
 }
 
 public class PrivaPubSource