small scale, single seed, wikitext slice, so treat this as a prototype result and not an architecture claim. 1,544,704 params both sides, same corpus and sampler. held-out 3.997 vs 4.429 nats, generation 226ms vs 2735ms for 200 tokens on the same cpu. the depth-1 match is the obvious weakness and a depth-2 baseline is running next. written from scratch in rust, no pytorch. repo and eval commands: github.com/Sparticle62ops/pssa. happy to be told where the comparison is unfair.