Emit Tiers

  1. JSONL emit (this repo, v0) — zero coupling to Nu’s plugin protocol; works today with ./app | from json

  2. Plugin protocol (later) — MsgPack/JSON IPC for native plugins when you need typed input too

Do not wait for a libnushell.so C ABI. Nu does not ship that, and chasing it before 1.0 is a trap.