- Move MAX_EMPTY_RESPONSE_RETRIES to constants.js for consistency - Handle 429/401/5xx errors properly during retry fetch - Use proper message ID format (crypto.randomBytes) instead of Date.now() - Add crypto import for UUID generation Code review by: Gemini 3 Pro Preview + Claude Opus 4.5 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>