An app that does not know a catalog item's kind refuses the whole signed file, so
the icons and builtin kinds can never go into catalog.json. `waybetter store build`
now writes catalog.json (format 2: theme, plugin, strings only; what every app
reads today) and catalog.v3.json (format 3: every kind) from the same items;
`sign` and `verify` handle the pair; the rules refuse a format 2 file that lists a
newer kind (CLI, JSON Schema, host). The host reads catalog.v3.json first and falls
back to catalog.json only when the newer file is not there (a newer file that does
not verify is an error). An item of a kind a version does not know is skipped
instead of refusing the file, so the next new kind costs current apps nothing.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>