jgrusewski e07c409950
revise(surfer): Phase 0 to CUDA-only per foxhunt architecture (CPU read-only) ...
Per feedback_cpu_is_read_only + pearl_cold_path_no_exception_to_gpu_drives +
feedback_no_cpu_test_fallbacks: NO CPU compute paths even for validation/cold
paths. Rewrites Phase 0 as CUDA kernels + Rust orchestration in crates/ml-alpha
(reusing build.rs cubin pipeline, mapped-pinned, determinism): floor kernels
(TSMOM signal, EWMA vol, portfolio backtest) + validation kernels (CPCV Sharpe,
PBO, Deflated Sharpe). CPU only enumerates split masks + reads final gate scalars
via mapped-pinned. GPU-oracle tests (no CPU reference). Runs on the local GPU.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com >
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