v0.12.1

Fixed

• npx @radicool/throughline init silently did nothing. npm invokes the bin
  through a node_modules/.bin symlink, which defeated the CLI's
  direct-invocation guard (pathToFileURL(process.argv[1]) never matched the
  real module path), so the installer exited 0 without installing. The guard
  now realpath-resolves argv[1] first, with a symlink-invocation regression
  test.