Force shorter AI responses — max 1-2 sentences

- Much stronger prompt language: "no more than 2 sentences EVER"
- Added "DO NOT ramble" instruction
- Reduced max_tokens back to 100 as hard limit

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/main.py

@@ -264,9 +264,10 @@ Continue naturally. Don't repeat yourself.
 {history}{context}
 HOW TO TALK:
 - Sound like a real person chatting, not writing.
-- Keep responses to 1-2 SHORT sentences. Be brief. This is a fast-paced call, not a monologue.
-- ALWAYS finish your sentence. Never leave a thought incomplete or trailing off.
+- MAX 1-2 sentences. Seriously — no more than 2 sentences EVER. One sentence is ideal.
+- ALWAYS finish your sentence. Never trail off mid-thought.
 - Swear naturally if it fits: fuck, shit, damn, etc.
+- DO NOT ramble, explain, or monologue. Say one thing and stop.
 
 SPELLING FOR TEXT-TO-SPEECH (use proper spelling so TTS pronounces correctly):
 - Write "you know" not "yanno" or "y'know"