Add workflow_call triggers to pub-scoop.yml and pub-aur.yml so the
stable release workflow can invoke them automatically after publish.
Wire scoop and aur jobs into release-stable-manual.yml as post-publish
steps (parallel with tweet), gated on publish success.
Update ci-map.md trigger docs to reflect auto-called behavior.
Adds Arch Linux distribution via AUR:
- dist/aur/PKGBUILD: package build template with cargo dist profile
- dist/aur/.SRCINFO: AUR metadata
- .github/workflows/pub-aur.yml: manual workflow to push to AUR