rega (7a7ca67b): on the dev server the corner widget never mounted, because /__plugin-gallery/manifest.json
built its profiles without the .meta.json fields only generate-tree read. Both now read them through one
module, internal/profile-meta.mjs (stage, heavy, widget per profile; bundle stage = production if any
profile says so), so the dev Studio and the built Studio cannot disagree. Verified: the dev model lists the
same 7 production bundles and rudder-voice:bottom-right; the built manifest is unchanged.
e53495dfcf