Replace the npm-only publish-cli.yml with a comprehensive release-cli.yml
that builds standalone binaries via pkg for all platforms (Linux/macOS/Windows,
x64/arm64), uploads them as GitHub Release assets with SHA256 checksums,
and retains npm publish as an optional job.
Add curl-pipe-sh installer (install.sh) and PowerShell installer (install.ps1)
for one-liner installation from GitHub Releases. Both scripts auto-detect
platform/architecture, verify checksums, and guide PATH configuration.
Add `game-ci update` command for self-updating standalone binaries: checks
GitHub releases for newer versions, downloads the correct platform binary,
verifies it, and atomically replaces the running executable.
Distribution strategy: GitHub Releases (primary), npm (optional), with
winget/Homebrew/Chocolatey/Scoop as future providers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
