The tagged ISO workflow fetched bos-settings/src/Cargo.toml from the
dev branch (404 after the Tauri split) and cargo-built bread-theme.
bread-theme 0.7.1 is already on the stable index. Stage required bins,
units, breadhelp content, and desktop/license files from the
minisign-verified index instead; optional bread-emit/module-host skip
until bread publishes them. Fail the bake if a required bin is missing.
