docs: reconcile README and docs with actual codebase

README:
- Remove duplicated agent config, safety, security sections (covered by docs)
- Add ux_design_system.md and safety.py to project structure and doc links
- Convert doc links to descriptive table

agent-config-guide.md:
- Replace fictional agents/tools with real ones from agents.yaml
- Remove nonexistent 'admin' permission level (only read/write)
- Fix template names (e-commerce, saas, fintech)
- List all available built-in tools

openapi-import-guide.md:
- Fix /result -> /classifications endpoint
- Fix POST /approve to show no request body
- Remove nonexistent 'admin' access type
- Update response examples to match actual API

demo-script.md:
- Fix agent names (order_agent -> order_lookup)
- Replace fictional refund scenario with real lookup+cancel flow

ARCHITECTURE.md:
- Fix langgraph-supervisor version (v1.1 -> 0.0.12+)

docker-compose.yml:
- Expose postgres on port 5433 for local dev

docker-compose.yml

@@ -5,7 +5,7 @@ services:
       POSTGRES_DB: smart_support
       POSTGRES_USER: smart_support
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-dev_password}
-    # ports: ["5432:5432"]  # Uncomment for local dev DB access only
+    ports: ["5433:5432"]  # Local dev: expose on 5433 to match backend/.env
     volumes:
       - pgdata:/var/lib/postgresql/data
     healthcheck: