Add BreadClient::command (unsourced bread.command.<app>.<verb> emit) plus
health/api_version, and a clap-free screenshot_cli helper for the next pin.
get.sh now dies if minisign or .minisig is missing — checksum-only is not
enough to install. Generate the README products table from the registry,
and refresh release-channels/CONTRIBUTING/CLAUDE.md to match.
CLAUDE.md now points to CONTRIBUTING.md as the canonical workflow doc
instead of duplicating the release lifecycle inline. docs/release-channels.md's
current-state table was stale — it still said beta/dev wasn't rolled out
to the sibling repos, which is now done.
