codegen: support arm64 as a development platform and build target on Windows 11

[paulo-assoc]

The problem

Perry should support ARM architecture on Windows because the Windows ecosystem is shifting toward ARM-based devices, and developers expect their tools and apps to run natively, efficiently, and without emulation penalties.

Justifications:

1. Growing market of ARM‑based Windows devices
2. Performance and efficiency advantages
3. Emulation using Prism is not a long‑term solution
4. Developer expectations
5. Cross‑platform consistency
6. Future‑proofing
7. Better user experience

Alternatives considered

None

Scope

Rough size estimate so we can triage:

• Small
• Medium
• Large

[proggeramlug]

Implemented in #8027. The PR adds native Windows ARM64 host detection, explicit windows-aarch64 / windows-arm64 targets, architecture-correct MSVC/xwin/SDK lookup, ARM64 runtime ABI handling, release/npm artifacts, and a native windows-11-arm build-and-execute CI smoke. Local cross-validation produced a 4.6 MB IMAGE_FILE_MACHINE_ARM64 PE. No version bump.