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

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

backend/app/services/extension_service.py

@@ -23,7 +23,7 @@ log = logging.getLogger(__name__)
 
 # The probe runs while the chip is drawing; names that take longer are skipped.
 _NAME_LOOKUP_SECONDS = 6.0
-# The poster picker waits on two pages of a channel's messages (#4488).
+# The poster picker waits on two pages of a channel's messages (#4491).
 _POSTER_LOOKUP_SECONDS = 20.0
 
 # A source's poster list (discord_ingester.AUTHORS_KEY) holds user ids; this
@@ -137,7 +137,7 @@ class ExtensionService:
         slug, and every path keyed off it, never moves (#130). Ignored on every
         other platform, and when the name can't be read.
 
-        `discord_authors` ([{id, name}], #4488) sets a Discord source's poster
+        `discord_authors` ([{id, name}], #4491) sets a Discord source's poster
         list in the same step, on a new source or one already there."""
         platform, raw_slug = self._derive(url)
         url = canonical_source_url(platform, url, raw_slug)
@@ -182,7 +182,7 @@ class ExtensionService:
             shaped["renamed_from"] = renamed_from
         return shaped
 
-    # -- Discord poster picker (#4488) ------------------------------------------
+    # -- Discord poster picker (#4491) ------------------------------------------
 
     def _discord_page(self, url: str) -> tuple[str, str]:
         platform, raw_slug = self._derive(url)