rob thijssen
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Adds a one-shot diagnostic that exercises the lower half of the TP stack — WorkerPool::spawn, init_nccl, nccl_sanity_check — in isolation from model load and inference. Runs N-1 worker subprocesses (rank 0 stays in this process), joins them in an NCCL communicator on the specified CUDA devices, all_reduces a sentinel 1u32 per rank, verifies the observed_sum equals world_size on every rank, then shuts down. Output is `status=ok` on stdout (plus key=value lines for tp_size and cuda_devices) when every check passes, non-zero exit + tracing on stderr otherwise. The smoke command is diagnostic-only and not exposed through the daemon HTTP API. script/tp-smoke.sh wraps it with an ssh invocation against a fleet host (default beast — the only host with 2 GPUs) and asserts the status line, mirroring the validate-neuron.sh ergonomics. This is step 1 of the TP test plan. A failure here means TP cannot work on the host at all; step 2 (Stage 7b-iv) wires real model load and inference through the same WorkerPool primitives. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>