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/Domain/Social/FollowService.cs

@@ -128,6 +128,8 @@ namespace PrivaPub.Domain.Social
 			{
 				return await _dbEntities.Followings.Match(f => f.AvatarId == follower.Id && f.TargetActorURI == targetUri).ExecuteFirstAsync(token);
 			}
+			//a new follow starts in no list, whatever lists the account was in before a follow that ended without passing here
+			await DB.Default.DeleteAsync<PersonaListMember>(m => m.AvatarId == follower.Id && m.AccountId == following.TargetAccountId);
 
 			if (local != default)
 				await FollowLocally(follower, local, following, token);
@@ -145,6 +147,7 @@ namespace PrivaPub.Domain.Social
 				return;
 
 			await DB.Default.DeleteAsync<Following>(following.ID);
+			await DB.Default.DeleteAsync<PersonaListMember>(m => m.AvatarId == follower.Id && m.AccountId == following.TargetAccountId);
 			if (following.TargetIsLocal)
 			{
 				await DB.Default.DeleteAsync<Follower>(f => f.LocalActorId == following.TargetAccountId && f.ActorURI == follower.Uri);