fix: remove dead automated user filtering code

The _is_automated_user method was never called - loop prevention is
handled by debouncing instead. User email filtering was intentionally
removed because the notification email is the page CREATOR, not editor.

- Remove unused _is_automated_user method
- Update test to verify notifications are processed regardless of user
- Remove obsolete test_automated_user_filtering test

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/services/wiki_change_listener.py

@@ -116,24 +116,6 @@ class WikiChangeListener:
         except Exception as e:
             logger.error(f"Failed to handle notification: {e}", exc_info=True)
 
-    def _is_automated_user(self, email: str) -> bool:
-        """
-        Check if email belongs to an automated system user.
-
-        These are edits made by library-desk via Wiki.js API (entity linking).
-        We skip processing these to prevent loops.
-
-        Customize this list based on your Wiki.js username for library-desk.
-        """
-        automated_users = [
-            self.settings.wikijs_username,  # Library-desk's Wiki.js API user
-            "library-desk@system",
-            "automation@system",
-            "bot@system"
-        ]
-
-        return email.lower() in [u.lower() for u in automated_users]
-
     def _is_recently_processed(self, page_id: int) -> bool:
         """Check if page was processed recently (debouncing)."""
         if page_id not in self._recent_notifications: