- Improve FALLBACK_SUMMARY to instruct agent to check CURRENT_WORK.md
- Add clear instructions to read memory files before responding
- Warn against hallucinating non-existent conversations
- Make memory flush prompt explicitly require CURRENT_WORK.md update
- Strengthen system prompt to emphasize this is mandatory
This prevents the agent from continuing conversations that never
happened when compaction summarization fails (e.g., no API key,
network error, etc.).
