Release builds add an arm64 MSI and portable zip, cross-compiled on the x64
runner (signing and WiX as for x64). package.ps1 checks each binary's PE
header before packaging: Machine must match -Arch, the app must be a GUI
program and the CLI a console program. It skips the CLI smoke run when an
ARM64 build can't run on the host. A new Windows ARM64 workflow packages the
ARM64 MSI, installs it on a Windows 11 ARM64 runner, checks both installed
exes are ARM64, runs the CLI, and uninstalls. Ported from printcraft#66.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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