Edit history from formerRepresentations

Pleroma and Akkoma send a post's earlier versions with it. A post PrivaPub first meets after its edits now has its
history, and an edit that carries them brings the versions missed in between; each is read as the post itself is. The
Akkoma scenario checks a post fetched after two edits by an account no persona follows.

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

PrivaPub.Tests/Federation/NoteParserTests.cs

@@ -90,6 +90,36 @@ namespace PrivaPub.Tests.Federation
 			Assert.Equal(["https://privapub.test/peasants/flor_pp98"], note.Cc);
 		}
 
+		// Pleroma's edited post carries its earlier versions (formerRepresentations, newest first)
+		[Fact]
+		public void Reads_the_earlier_versions_of_a_pleroma_edit()
+		{
+			var note = NoteParser.Parse(JsonNode.Parse(File.ReadAllText(Path.Combine(AppContext.BaseDirectory, "Fixtures", "pleroma", "edited.json"))));
+
+			var before = Assert.Single(note.FormerRepresentations);
+			Assert.StartsWith("tomorrow library garden bridge", before.ContentHtml);
+			Assert.Equal(new DateTime(2026, 10, 5, 0, 49, 58, DateTimeKind.Utc).AddTicks(8_600_710), before.EditedAt);
+			Assert.Null(before.SpoilerText);
+			Assert.EndsWith("(edited)", note.ContentHtml);
+		}
+
+		[Fact]
+		public void Earlier_versions_come_oldest_first_each_read_as_the_post_is()
+		{
+			var note = NoteParser.Parse(JsonNode.Parse("""
+				{"id":"https://pl.example/objects/1","type":"Note","attributedTo":"https://pl.example/users/carol","content":"<p>third</p>",
+				 "published":"2026-10-06T08:00:00Z","updated":"2026-10-06T09:00:00Z",
+				 "formerRepresentations":{"type":"OrderedCollection","totalItems":2,"orderedItems":[
+				  {"type":"Note","content":"<p>second</p>","summary":"careful","published":"2026-10-06T08:00:00Z","updated":"2026-10-06T08:30:00Z"},
+				  {"type":"Note","content":"<p>first<script>x</script></p>","summary":"","published":"2026-10-06T08:00:00Z"}]}}
+				"""));
+
+			Assert.Equal(["<p>first</p>", "<p>second</p>"], note.FormerRepresentations.Select(r => r.ContentHtml));
+			Assert.Equal([new DateTime(2026, 10, 6, 8, 0, 0, DateTimeKind.Utc), new DateTime(2026, 10, 6, 8, 30, 0, DateTimeKind.Utc)],
+				note.FormerRepresentations.Select(r => r.EditedAt));
+			Assert.Equal([(default(string), false), ("careful", true)], note.FormerRepresentations.Select(r => (r.SpoilerText, r.HasContentWarning)));
+		}
+
 		[Fact]
 		public void Reads_a_lemmy_page_with_a_title()
 		{