Show HN: Castov – A local-first desktop automation engine using local AI

Castov is a local-first toolkit whose 13 utilities run in the browser, in the terminal via `npx castov`, and inside Cursor or Claude through an MCP server. It advertises zero-data logging, tool pipelines that chain outputs between utilities, and encrypted URL shares that keep payloads in the URL hash fragment. Some features use the network by design, including encrypted Env Vault uploads, P2P Ghost Tunnel STUN discovery, and Developer Canvas WebRTC signaling servers.