perf(gpu_prover): [DO NOT MERGE] Radix 8 NTT experiments#183

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mcarilli wants to merge 6 commits intodevfrom

Commits on Jan 1, 2026

infrastructure and first kernel work
mcarilli
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Commits on Jan 4, 2026

6-stage nonfinal kernel written, still debugging
mcarilli
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Commits on Jan 6, 2026

fix bugs. 2^24 works.
mcarilli
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forgot files
mcarilli
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Commits on Jan 8, 2026

clean up geometry calculation + format
mcarilli
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Commits on Jan 12, 2026

performance experiments
mcarilli
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