Starts the app and serves Tidewave's MCP at
http://localhost:<port>/tidewave/mcp so a coding agent can evaluate code
inside the running project. Tidewave ships only as a Phoenix plug, so this
runs that plug under Bandit for a library with no endpoint.
mix tidewave # port 4000
mix tidewave --port 4123Lives in dev/, compiled only in :dev and left out of the Hex package.