Analyze simulator hot paths and GPU versus Rust acceleration

docs/work/2026-10-10/performance/baseline-time.txt

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+61.76user 0.19system 1:03.43elapsed 97%CPU (0avgtext+0avgdata 41032maxresident)k
+4160inputs+60347outputs (649major+10431minor)pagefaults 0swaps

docs/work/2026-10-10/performance/optimized-time.txt

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+53.74user 0.08system 0:54.16elapsed 99%CPU (0avgtext+0avgdata 41196maxresident)k
+2288inputs+60345outputs (6major+10811minor)pagefaults 0swaps

docs/work/2026-10-10/performance/profile-time.txt

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+56.90user 0.11system 0:57.31elapsed 99%CPU (0avgtext+0avgdata 41636maxresident)k
+336inputs+61312outputs (660major+10696minor)pagefaults 0swaps