VitalSync: Health Intelligence Agent

Built a production-grade health intelligence agent using the ReAct pattern on Gemini 2.5 Flash. Routes queries across 4 specialized tools with semantic-vs-system error classification. Implemented an LLM-as-judge regression suite for automated quality evaluation. Runs async TTL-scoped memory extraction with per-user observability via Helicone. Deployed on AWS with infrastructure as code via Terraform.