Add production features: circuit breaker, exponential backoff, semantic caching, intent-based scope handling

Fix interview-critical issues: state mutation anti-pattern, documentation accuracy, prior frustration handling, security notes

Fix critical bugs: compensation for late orders, escalation detection, conversation history improvements

Add clarification node for missing order IDs + rule-based fallbacks to prevent 504 timeout

Fix contradictory logic: Conditional tone based on delivery timing, frustration threshold 0.5, celebrate early deliveries

Fix: All 7 critical bugs + 4 security enhancements + compensation policy

Initial commit: Olist intelligence layer with database