Integrate ARM64 NUDUPL VDF path and harden Windows CI/builds

[hoffmang9]

Summary

• Integrate the ARM64 NUDUPL VDF path and related core plumbing, including the new base-integer VDF implementation and listener/profile support.
• Expand and harden cross-platform build support across CMake, Makefile.vdf-client, Python packaging metadata, and Rust workflow pieces.
• Improve Windows compatibility in asm/runtime paths (ABI handling, AVX-related behavior, and portability fixes) needed for reliable Windows execution.
• Update CI workflows (test.yaml, rust.yml) and project docs to match the current Windows runner/toolchain setup and remove stale perf-only assumptions.

Test plan

• GitHub Actions test.yaml passes on Ubuntu, macOS, and Windows.
• GitHub Actions rust.yml passes.
• vdf_client, vdf_bench, and VDF tests build and run in CI for the enabled configurations.

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Note

High Risk
Touches low-level asm generation, CPU feature gating, and threading/prover paths, plus broad build-system/CI changes across platforms, so regressions are plausible without extensive cross-OS testing.

Overview
This PR expands cross-platform build and CI support by adding Windows to the main test.yaml matrix, introducing a CMake/Ninja-based Windows build + smoke tests/benchmarks, and hardening macOS tool/bootstrap steps (Boost/CMake install + include path detection). It also updates cibuildwheel macOS setup to be more reliable and documents new CMake build toggles and AVX runtime flags in README.md.

On the native side, it significantly refactors src/CMakeLists.txt to add explicit build options/targets for vdf_client, vdf_bench, test binaries, and HW tools; generates asm sources via compile_asm; and adds Windows-specific handling for MPIR/Boost discovery, linker flags, and clang-cl optimizations.

Core/runtime changes improve portability and robustness: AVX feature detection is made thread-safe and configurable via env flags (plus optional logging), asm codegen is adjusted for Windows sections/ABI + register/stack/XMM save/restore, string parsing utilities become thread_local, and several concurrency/ correctness fixes are added (mutex-protected access to 2-weso cached forms, safer thread shutdown in 2weso_test, bounds checks in prover logic, and safer integer printing). A new vdf_base_integer.cpp adds additional GMP-backed integer/form helpers used by the base VDF implementation.

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[hoffmang9]

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[hoffmang9]

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[hoffmang9]

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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PowerShell $args shadows automatic variable in CI

Low Severity

The Invoke-TestExe function declares a parameter named $args, which shadows PowerShell's built-in automatic variable $args. While the splatting via @args works correctly with pwsh (PowerShell 7) in the current usage, this is a well-known anti-pattern that can cause subtle argument-binding issues if the function signature or call pattern changes. Using a different name like $testArgs avoids the ambiguity entirely.