v0.5.0 — codebase refinement, flexible API, architecture cleanup

Error handling:
  thiserror enum (NotFound/BadRequest/Unauthorized/Forbidden/Internal)
  eliminates 41 boilerplate .map_err() calls
  signature failures return 401, not 500

Named types:
  Keypair, LocalObject (with to/cc/bto/bcc addressing), Addressing

Readability:
  descriptive names everywhere, small functions, breathing room
  noisy comments removed, intent-explicit error handling (no let _ =)
  types.rs per module separating data from behavior

File organization:
  handlers/ module (actor, featured, followers, inbox, nodeinfo, outbox, webfinger)
  actors/ split (mod.rs + person.rs + types.rs)
  service/ split (builder, broadcast, collections, delivery, fetch, follow, lookup, types)
  tests next to modules

Repository traits:
  FollowRepository → 5 sub-traits (FollowerWriter/Reader, FollowingWriter/Reader, FollowMigration)
  ActorRepository → 3 sub-traits (KeypairRepository, RemoteActorCache, AnnounceRepository)
  BlocklistRepository → 2 sub-traits (DomainBlocklist, ActorBlocklist)
  supertraits with blanket impls — existing consumers unchanged
  FollowMigration has default no-op
  delete dead get_following_outbox_url

Testing:
  mock_repo! macro generates mock builders from compact specs
  MockFollowRepo, MockActorRepo, MockBlocklistRepo, MockActivityRepo,
  MockUserRepo, MockContentReader, MockObjectHandler, MockEventPublisher
  all hand-written test stubs replaced

Flexibility:
  UrlScheme trait — configurable URL patterns (DefaultUrlScheme = /users/{uuid})
  on_unknown_activity hook for custom AP extensions
  broadcast_raw_to_followers for arbitrary activity JSON
  broadcast_create/broadcast_update (renamed from Note-centric names)
  internal modules locked to pub(crate), clean public re-exports
  actor_handler, followers_handler, following_handler re-exported for custom routers

Security:
  SSRF: block IPv6-mapped private IPv4, TEST-NET, benchmarking, reserved ranges
  verify_attributed_to rejects missing/array attributedTo
  remove .expect() from outbox handler

Architecture:
  handlers/followers.rs delegates to serialize_ordered_collection (no more UrlScheme bypass)
  extract dispatch_sends, prepare_addressed_broadcast (eliminate duplication)
  DbActor::object_id(), RemoteActor::from/from_ap_person/placeholder
  send_activity unifies prepare+dispatch, deterministic_activity_id helper
  pass-through wrappers grouped in lookup.rs

src/activities/delete.rs

@@ -52,9 +52,9 @@ impl Activity for DeleteActivity {
             _ => String::new(),
         };
         if !object_domain.is_empty() && actor_domain != object_domain {
-            return Err(Error::bad_request(anyhow::anyhow!(
-                "Delete actor domain does not match object domain"
-            )));
+            return Err(Error::bad_request(
+                "Delete actor domain does not match object domain",
+            ));
         }
         Ok(())
     }
@@ -78,17 +78,13 @@ impl Activity for DeleteActivity {
             return Ok(());
         };
         if object_url == *self.actor.inner() {
-            data.object_handler
-                .on_actor_removed(&actor_url)
-                .await
-                .map_err(|e| Error::from(anyhow::anyhow!(e)))?;
+            data.object_handler.on_actor_removed(&actor_url).await?;
             tracing::info!(actor = %actor_url, "received Delete(actor) — remote account deleted");
             return Ok(());
         }
         data.object_handler
             .on_delete(&object_url, &actor_url)
-            .await
-            .map_err(|e| Error::from(anyhow::anyhow!(e)))?;
+            .await?;
         tracing::info!(object = %object_url, "received Delete(note)");
         Ok(())
     }