Extend the Node-free guard beyond oauth-persist.ts to every module
reachable from the browser's RemoteOAuthStorage (storage-remote,
oauth-storage, store, oauth-persist, store-serialize), so a forbidden
store-io/node:/atomically import added one hop away is caught too — not
just a direct import in oauth-persist.ts. Addresses the non-blocking
hardening note on Claude review of #1612.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>