Add Omasend

[huacnlee]

Summary

https://github.com/huacnlee/omasend

• add Omasend 0.1.4 for x86_64 and aarch64
• install the published, checksum-verified Linux release archives
• track stable GitHub releases declaratively through upstream, using SHA256SUMS and a 24-hour quarantine window
• declare the libxkbcommon-x11 runtime dependency required by the released binary

Validation

• bin/sync-upstream self-test passed in an x86_64 Arch Linux container.
• bin/sync-upstream omasend passed against the live release feed.
• Verified the declarative provider discovers v0.1.3 and both architecture checksum entries when given a temporary v0.1.2 package fixture.
• Verified the v0.1.4 x86_64 and aarch64 checksums against the published SHA256SUMS manifest.
• makepkg --nodeps --noconfirm produced the x86_64 package, verified source checksums, and included the binary, desktop entry, icon, and license.
• Inspected ELF dependencies with readelf; added the missing libxkbcommon-x11 dependency afterward. Shell syntax and diff checks passed on the final recipe.

The temporary container required pacman's --disable-sandbox to work around the local runtime's ALPM seccomp incompatibility. The makepkg check skipped dependency resolution; full Omarchy dependency installation, graphical startup, LAN transfers, and aarch64 package execution remain unverified.