jumoo-website: reminder emails, repo history, docs

jumoo-website: reminder summary email now includes each subscription's expiry date alongside the domain
jumoo-website: pushed the local checkout's full history over the GitHub repo's stale content, so jumoo-website is now confirmed as the live source (old remote history kept at backup/pre-overwrite-main)
jumoo-website: added root README.md and CLAUDE.md summarizing the site, checkout system, and local dev setup
jumoo-context: updated supported-packages.md to record jumoo-website as confirmed-live and flag JumooSite as an archive/delete candidate, merged via PR #31