The v0.3.0-alpha release was created before the --tag feature was
added to install.sh, so installing from that tag fails with "Unknown
option: --tag=v0.3.0-alpha".
Solution: Always download install.sh from main (which has --tag support)
and pass the release tag as a parameter. This ensures users get a working
installer that can install the specific stable release.
Changes:
- web/src/app/page.tsx: Download from main instead of ${latestRelease}
- README.md: Update install commands to download from main
- docs/INSTALL.md: Update install command
- .github/workflows/release.yml: Update release notes
