- doc/28-AI-CHAT-AGENT.md: comprehensive technical documentation covering
architecture, agent design, query_cv tool, HTMX integration, graceful
degradation, security, and example conversations
- README.md: add AI Chat Agent section with examples, ADK Go badge,
updated tech stack and documentation index
- doc/00-GO-DOCUMENTATION-INDEX.md: add chat agent to doc index
juanatsap