Adds a GET /install.sh endpoint on the backend (embedded via Go's
embed package, so the script stays a real, shellcheck-able .sh file
rather than a Go string literal). Auto-detects OS/arch (including
Termux on Android via $PREFIX) and always resolves the latest GitHub
release via the /releases/latest/download/ redirect, so unlike the
winget/brew/AUR manifests it needs no per-release maintenance.
Verified end-to-end in an ephemeral Ubuntu container (both the normal
/usr/local/bin path and the Termux $PREFIX path), and locally against
a running backend instance.
Documented alongside the existing winget/Homebrew instructions in
README.md, the release notes template, the web CLI page, and the
per-product CliHandoff card.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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