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/MastodonAccountsTests.cs

@@ -619,7 +619,6 @@ namespace PrivaPub.Tests.Http
 			var alice = await _host.Mastodon("alice");
 
 			Assert.Empty((await _host.Client().Get($"/api/v1/accounts/{alice.Id}/featured_tags")).Ok().Array);
-			Assert.Empty((await alice.Client.Get($"/api/v1/accounts/{alice.Id}/lists")).Ok().Array);
 			var familiar = (await alice.Client.Get($"/api/v1/accounts/familiar_followers?id[]={alice.Id}")).Ok();
 			Assert.Equal(alice.Id, Assert.Single(familiar.Array).Text("id"));
 			Assert.Empty(familiar.Array[0]!["accounts"]!.AsArray());