Feat/multi merkle tree gpu resident - #951
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…he batched prover
…r (hybrid resident handles)
…E download for plain tables)
Per table the batched prover still ran a redundant HOST LDE FFT (main+aux) to feed prep trees / retained_main / later phases, leaving the GPU idle. This completes the device port: - aux/main: resident device expand first; host-expand only for the small-table fallback / Retain. A per-table commit-stream sync closes an async race the old host FFT delay had hidden. - OOD (phase 4): device-recompute device-only + read the trace OOD via the GPU barycentric fast path (no host coset eval, no D2H download). Byte-identical proof (roots unchanged); all batched tests pass. e22 mainnet prove 284s -> 155s (-45%), GPU util 17% -> 44%. Budget test updated: phase 4 is now a full device expansion.
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