164 release rejects imported prototype

// Transitive gate: the entry module is NOT itself prototype, but it imports a
// module that IS (`app/lib/proto` carries `[prototype]`). A `--release` build
// must still reject it — the gate refuses a prototype module ANYWHERE in the
// import graph, not just the entry file. Drop --release and this runs (a dev
// build allows prototype dependencies).

import std/io
import app/lib/proto

app/lib/proto:greet(name: "world"): msg |> std/io:print.ln(msg)