Henildiyora/nexus ? reverse-engineered prompt

Build me a production ready AI agent memory backend called Nexus.

I want a Go service that lets AI agents store, update, and search memory across many tenants, with strong isolation so one user can never read another user’s data. It should support both normal lookup and semantic search, use CockroachDB as the source of truth, Redis for fast reads, and expose the app through gRPC. Also include an MCP server so Claude or other MCP compatible agents can connect without custom glue.

Please make it runnable with Docker Compose, include sensible config for metrics and monitoring, and wire up Prometheus so I can see what the service is doing. If anything is unclear, look up the current docs online and make practical choices. I’d like the code to feel like something that could actually be deployed, not just a demo.