The feed memory test counts the deletions it was told of

In one full run (241 of 242 passing) the home feed came back from a thread with fewer posts than it was left with, and
passed three times alone. The feed takes a post out at once when the stream says it was deleted, and earlier tests do
delete posts in that persona's home, but PrivaPub's log shows no federated Delete at that minute, so the cause is not
proven. The test now allows for the deletions the stream reported during the trip and says the three numbers when it
fails; with none reported, a shorter feed still fails, and coming back still may not read the home feed again.

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

tests/e2e/Actions/FeedMemoryTests.cs

@@ -14,6 +14,13 @@ namespace decePubClient.E2E.Actions
 			var persona = Pasture.Personas().First();
 			await using var session = await SignIn.As(browser, persona);
 			var page = session.Page;
+			// a deletion the stream tells (late federated Deletes from the tests before) takes its post out at once
+			var deletions = 0;
+			page.WebSocket += (_, socket) => socket.FrameReceived += (_, frame) =>
+			{
+				if (frame.Text?.Contains("\"event\":\"delete\"") == true)
+					Interlocked.Increment(ref deletions);
+			};
 			await Results.Cell("client.action.feed-memory", "privapub", persona.UserName, async () =>
 			{
 				await page.GotoAsync($"{Pasture.Site}/");
@@ -25,6 +32,7 @@ namespace decePubClient.E2E.Actions
 				await page.EvalOnSelectorAsync("#feed-scroll", "root => root.scrollTop = root.scrollHeight");
 				await Pasture.Eventually(async () => int.Parse(await feed.GetAttributeAsync("data-feed-count") ?? "0") > 20, 10);
 				var count = int.Parse(await feed.GetAttributeAsync("data-feed-count") ?? "0");
+				var deletedBefore = Volatile.Read(ref deletions);
 
 				var homeReads = 0;
 				page.Request += (_, request) =>
@@ -38,7 +46,9 @@ namespace decePubClient.E2E.Actions
 				await page.GoBackAsync();
 				await page.Locator("article[data-uri]").First.WaitForAsync(new() { Timeout = 10000 });
 
-				Assert.True(int.Parse(await feed.GetAttributeAsync("data-feed-count") ?? "0") >= count, "the feed came back shorter than it was left");
+				var back = int.Parse(await feed.GetAttributeAsync("data-feed-count") ?? "0");
+				var deleted = Volatile.Read(ref deletions) - deletedBefore;
+				Assert.True(back >= count - deleted, $"the feed came back with {back} posts, left with {count} ({deleted} deleted meanwhile)");
 				Assert.Equal(0, homeReads);
 				await session.AssertGuards();
 			}, page);