fix: usar assignmentUserIds para mentionsForSending

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

src/services/command.ts

@@ -137,9 +137,7 @@ export class CommandService {
       }))
     );
 
-    const mentionsForSending = ensuredAssignees.length > 0
-      ? ensuredAssignees.map(uid => `${uid}@s.whatsapp.net`)
-      : [];
+    const mentionsForSending = assignmentUserIds.map(uid => `${uid}@s.whatsapp.net`);
 
     const assignedList = assignmentUserIds.map(uid => `@${uid}`).join(' ');
     const resp =