The install page shows a manifest's name, description and icon only when the manifest's host allows CORS. GitHub file pages (github.com/<o>/<r>/blob|raw/<ref>/<path>) are now turned into their raw.githubusercontent.com address by the page (preview and the frameport:// link it hands over) and by deeplink.parse (a /blob/ page is HTML, so FramePort couldn't install from it). Release downloads can't be read by any web page: the page shows the release's name and the repo's description from GitHub's API instead of 'A game or app'. INSTALL_BUTTON.md says where to host a manifest.
A manifest may name its build's version (top-level "version" or
"frameport": {"version"}). FramePort keeps it with the game's link record
and, at start (at most every 6 h), fetches remembered web manifests again;
a newer version marks the game link_update. The Library bar and the game
page offer to download and install it (one confirmation, same download path
as a first install, a name the user gave is kept). CLI: frameport
link-updates [--install]. Docs: INSTALL_BUTTON.md.
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