perf(cuda): complete persistent CUB migration - #484
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Summary: replace the remaining production CUDA Thrust sort/scan/fill paths with CUB wrappers backed by persistent per-stream scratch storage; add legacy and V0 BVH initialization fixes plus V0 brute-force parity coverage; clarify that the active PCG matrix is symmetric 3x3 BCOO rather than BSR; and skip native/wheel matrices for docs-only changes. Validation: CUDA backend build/link; clang-format 18; legacy/default/V0 BVH 38 assertions; MAS 10 cases/275 assertions; full simulation suite 95 cases/14212 assertions; MAS regression 4 assertions; workflow YAML and repository-contract tests.