Drives a real `zot rpc` subprocess through the Colibri Spawner (rpc_stdin) +
RpcSender and asserts the full path: stdin piped → framed prompt delivered →
zot echoes it (user_message) → response ack → done. Closes the 'live zot rpc
smoke pending' item on colibri#143.
A placeholder DeepSeek key is enough — the turn 401s deterministically while
the driver wiring (the subject) runs fully. #[ignore] + ZOT_BIN-gated, so it
never runs in normal cargo test / CI:
ZOT_BIN=/path/to/zot cargo test -p colibri-daemon --test zot_rpc_smoke -- --ignored
Validated on this host (zot v0.2.42, Go 1.24.4): passes.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>