feat: support ARM64 Windows driver builds

[phaedrus1992]

ARM64 Windows Driver Support

Explore and implement support for building Sideblinder drivers for ARM64 Windows systems (e.g., Surface Pro X, Windows on ARM devices).

Investigation Required

WDK Availability

• Verify if windows-2022 CI runner has ARM64 headers in its WDK installation
• Identify WDK version and available architecture targets
• May need to add diagnostic CI step to list available WDK architectures

Rust Toolchain

• Add aarch64-pc-windows-msvc target support
• Verify current Rust version has stable LLVM support for ARM64 Windows
• May require additional toolchain components

Configuration & Build

• Add .cargo/config.toml entry for ARM64 with static CRT linking
• Consider i686 target as well for legacy Windows support
• Design CI build matrix for multiple architectures (x86_64, ARM64, optional i686)

Driver Distribution

• Update INF file to support multiple architectures
• Plan for multi-architecture driver packaging
• Document installation on ARM64 Windows systems

Risks & Constraints

• WDK 2022 may have incomplete ARM64 support
• No practical way to test ARM64 drivers without actual hardware
• Rust ARM64 MSVC toolchain stability unknown
• May require additional CI setup or custom WDK installation

Success Criteria

• CI successfully detects ARM64 support in WDK
• Cargo builds for aarch64-pc-windows-msvc target
• CI matrix builds both x86_64 and ARM64 variants
• Driver INF updated for multi-architecture support
• Documentation covers ARM64 builds

Related

• Issue Sprint: Driver safety, concurrency, and IPC versioning #43: Driver safety, concurrency, and IPC versioning (current WDK setup)