Verifying the setup helper CLI

The surface is node skills/a1-yandex-kit-setup/scripts/setup.mjs <command>. No build step — plain Node 20+, no dependencies.

Recipes that work

• stdin protocol (no-EOF regression): feed the token through a FIFO and keep the write end open; the helper must exit on its own:

  mkfifo "$TMP/pipe"
  node .../setup.mjs configure --client cursor --config "$TMP/mcp.json" --token-stdin --json < "$TMP/pipe" &
  exec 3>"$TMP/pipe"; printf 'token\n' >&3; wait $!   # exits ~0.3s
  

  Do not time (printf ...; sleep N) | node ... — the pipeline waits for the sleep, not the helper.