chore: the poster-picker comments name their task #4491

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/app/services/discord_client.py

@@ -76,7 +76,7 @@ _THREADS_BATCH = 25
 _MAX_429_RETRIES = 4
 _429_WAIT_SECONDS = 60.0
 # How far back the poster picker looks: two pages. Enough to see who posts in
-# a channel, few enough to answer while the operator waits (#4488).
+# a channel, few enough to answer while the operator waits (#4491).
 _POSTER_SCAN = 200
 
 # https://discord.com/developers/docs/resources/message#message-object-message-types
@@ -667,7 +667,7 @@ class DiscordClient:
         self, server_id: str | None, channel_id: str, *, max_messages: int = _POSTER_SCAN,
     ) -> dict:
         """Who has posted lately in a channel, for picking a source's poster
-        list (#4488): the newest `max_messages` messages, tallied per author.
+        list (#4491): the newest `max_messages` messages, tallied per author.
         Deliberately shallow — it answers "who posts here", not "who ever did".
         Every poster comes back with their stable id, which is what the list
         stores: a username can change on a whim, an id can't."""