chore(release): add AUR-only release test workflow

[benjaminshafii]

Summary

• Adds a throwaway AUR Release Test workflow gated to this branch/PR.
• Builds only the Linux x64 Electron release tarball, uploads it to an aur-test-* prerelease, then reuses AUR Validate with push_to_aur=true.
• Intentionally skips the normal release pipeline: no macOS, Windows, npm, sidecars, Daytona, or stable release tag.

Evidence

Build verification

• ruby -e 'require \"yaml\"; YAML.load_file(\".github/workflows/aur-release-test.yml\"); puts \"YAML parsed\"' -- passed
• pnpm install --frozen-lockfile -- passed
• pnpm --filter @openwork/desktop typecheck:electron -- failed on existing apps/desktop/electron/browser-mcp.mjs TypeScript errors (TS1127, TS2339, TS1064), unrelated to this workflow-only change
• pnpm dlx actionlint .github/workflows/aur-release-test.yml -- could not run because the npm actionlint package exposes no binary

API verification

• No API changes.

UI verification

• No UI changes.

Test instructions

1. Keep this PR as draft and do not merge it.
2. Let the AUR Release Test check run on this PR branch.
3. Confirm it creates an aur-test-* GitHub prerelease containing openwork-linux-x64-*.tar.gz.
4. Confirm the reused AUR Validate job builds/install-smokes the package and pushes to the configured AUR repo.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openwork-app	Ready	Preview, Comment	May 7, 2026 6:00pm
openwork-den	Ready	Preview, Comment	May 7, 2026 6:00pm
openwork-den-worker-proxy	Ready	Preview, Comment	May 7, 2026 6:00pm
openwork-landing	Ready	Preview, Comment, Open in v0	May 7, 2026 6:00pm
openwork-share	Ready	Preview, Comment	May 7, 2026 6:00pm

[benjaminshafii]

Verification

The throwaway AUR workflow completed successfully on this PR.

• AUR Release Test run: https://github.com/different-ai/openwork/actions/runs/25513123288
• Resolve AUR test release: passed in 22s
• Build Linux x64 release asset: passed in 11m28s
• Validate and publish AUR package / Validate AUR package (x86_64, publish-ready): passed in 1m45s
• Created prerelease: aur-test-v0.13.4-aurtest.2.1-81e3703
• Published AUR package version: 0.13.4+aurtest.2.1.81e3703

Note: the first run exposed an Electron tarball root mismatch for SemVer build metadata. Commit 99853e88 fixed that by normalizing the tarball root before upload, and the rerun passed through AUR publish.