Lists: a persona's followed accounts, read apart

Mastodon's lists replace the empty stubs: CRUD, members (only accounts the
persona follows; a follow that ends takes its memberships with it),
accounts/:id/lists, and timelines/list/:id from the persona's home entries
with the replies policy (followed, list, none; self-replies and replies to
the persona always). An exclusive list's members stay out of home. Lists
never federate, and go with a deleted persona.

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

PrivaPub.Tests/Http/MastodonTimelinesTests.cs

@@ -105,14 +105,6 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal(new[] { later, open }, (await alice.Client.Get($"/api/v1/timelines/tag/%23{tag}")).Ok().Ids);
 		}
 
-		[Fact]
-		public async Task A_list_timeline_is_an_empty_stub()
-		{
-			var alice = await _host.Mastodon("alice");
-
-			Assert.Empty((await alice.Client.Get("/api/v1/timelines/list/anything")).Ok().Array);
-		}
-
 		[Fact]
 		public async Task Favourites_list_what_the_persona_liked_newest_first()
 		{