Adds docs/pfi/llm-seat-catalog.md, the durable hand-curated record of what each
seat IS -- lineage, provenance, model-card facts, quantization, speculative
decoding, licenses, and measured warm tok/s + deep-prefill depth results with
their harness and date. It complements the auto-generated
fv-ml1-gpu-seat-inventory.md (live placement/KV/concurrency): the two split by
volatility, and the catalog defers to the inventory for any live number.
Adds scripts/seat-bench.py so the catalog's speed/depth numbers are reproducible
(warm decode tok/s, n=3, conc=1, median; deep prefill at ~0.97x max-model-len
with an allocator-log OOM scan). Serial by design -- concurrent deep prefills
would confound both OOM and tok/s.
Captures the 2026-09-14 measurements: all six generative seats prefill to ~255K
(coder ~16K) with zero OOM/CUBLAS/illegal-memory; warm decode 62.7-337.3 tok/s;
per-seat VRAM. seat-inventory.py now cross-links the catalog in its footer.
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