[Marc-André Moreau (mamoreau-devolutions)]

Summary

• Build and sign x64 and ARM64 MSIX packages alongside the existing MSI and ZIP artifacts.
• Derive the MSIX publisher from the signed executable so package identity matches the release signing certificate; validate signed x64 installation and removal in release builds.
• Publish .zip assets without the -portable filename suffix and document the new package formats.

Validation

• cargo build --release --locked -p jiffshot
• cargo test --locked -p jiffshot-workflow icon::tests
• Parsed workflow YAML and MSIX PowerShell scripts; exercised logo generation and manifest identity updates locally.