Add debug logging to federation publish handler

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

events/handlers/federation_handlers.py

@@ -30,14 +30,17 @@ async def _try_publish(
 ) -> None:
     """Publish an AP activity if federation is available and user has a profile."""
     if not services.has("federation"):
+        log.debug("_try_publish: no federation service")
         return
 
     if not user_id:
+        log.debug("_try_publish: no user_id for %s#%s", source_type, source_id)
         return
 
     # Check user has an ActorProfile (chose a username)
     actor = await services.federation.get_actor_by_user_id(session, user_id)
     if not actor:
+        log.warning("_try_publish: no ActorProfile for user_id=%s", user_id)
         return
 
     # Don't re-publish if we already have an activity for this source
@@ -45,6 +48,7 @@ async def _try_publish(
         session, source_type, source_id,
     )
     if existing and activity_type == "Create":
+        log.debug("_try_publish: already published %s#%s", source_type, source_id)
         return  # Already published
 
     try: