fix json issue

per masterdai https://discord.com/channels/1253563208833433701/1300025221834739744/1327947002943770705

Author: odilitime

packages/plugin-twitter/src/templates.ts

@@ -19,4 +19,6 @@ Generate a tweet that:
 4. Must be UNDER 180 characters (this is a strict requirement)
 5. Speaks from the perspective of {{agentName}}
 
-Generate only the tweet text, no other commentary.`;
+Generate only the tweet text, no other commentary.
+
+Return the tweet in JSON format like: {"text": "your tweet here"}`;