Add macOS release builds and remove Windows ARM 32-bit

[odinho]

Summary

• Add darwin/amd64 (Intel) and darwin/arm64 (Apple Silicon) to release builds
• Remove Windows ARM 32-bit builds (non-existent architecture)
• Update Makefile to build and install appropriate macOS binaries based on architecture

Rationale

• macOS builds were missing from releases despite Go's cross-compilation support
• Having direct binary downloads is useful for developer installs and CI/CD pipelines without requiring Homebrew
• Windows ARM 32-bit has no real-world usage (only ARM64 exists for Windows on ARM)
• Linux ARM 32-bit retained for Raspberry Pi and embedded device support

Release Impact

New release artifacts will include:

• macOS: darwin/amd64, darwin/arm64
• Linux: linux/amd64, linux/arm64, linux/arm
• Windows: windows/amd64, windows/arm64

[CLAassistant]

All committers have signed the CLA.