Add terse-answer guidance to the interactive system prompt and a hard
ceiling of 3 packets (3 x connector.max_chars) on LLM replies, with an
"ask for more" indicator when truncated. Protects LoRa airtime from
runaway replies. Broadcast chunking unchanged.
Co-authored-by: Matt Johnson <mj@k7zvx.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
