Funkwhale's answers, deletions and NodeInfo are understood

Three shapes Funkwhale 2.0 sends, each of which lost something:
- its Accept is named after the Follow it answers, on our origin (`…#follows/<uuid>/accept`), and was refused as off its
  actor's origin, so no follow of a channel completed: an Accept or Reject whose id extends the id of the activity it
  answers, on our origin, is now taken;
- a channel deletes its uploads in one Delete without an id, their ids in a list as the object's id: each is deleted;
- its NodeInfo discovery names the document under its swagger schema's URL: a link whose path names NodeInfo is taken
  when no rel is known.

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

PrivaPub/Federation/Objects/InstanceDocuments.cs

@@ -38,6 +38,12 @@ namespace PrivaPub.Federation.Objects
 					if (link.ValueKind == JsonValueKind.Object && Text(link, "rel") == schema && Text(link, "href") is { } href
 						&& href.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
 						return (href, schema[(schema.LastIndexOf('/') + 1)..]);
+			// a link to a NodeInfo document under another rel (Funkwhale 2.0 names it after its swagger schema): its path
+			// says what it is, and its last segment the version
+			foreach (var link in list.EnumerateArray())
+				if (link.ValueKind == JsonValueKind.Object && Text(link, "href") is { } href && href.StartsWith("https://", StringComparison.OrdinalIgnoreCase)
+					&& Uri.TryCreate(href, UriKind.Absolute, out var target) && target.AbsolutePath.Contains("/nodeinfo", StringComparison.OrdinalIgnoreCase))
+					return (href, target.Segments[^1].Trim('/') is var last && Schemas.Any(s => s.EndsWith("/" + last, StringComparison.Ordinal)) ? last : "2.0");
 			return default;
 		}