Add .codex-plugin/plugin.json so Codex loads REA with its own display
metadata, and make the repository a single-plugin marketplace for both
clients through .agents/plugins/marketplace.json and
.claude-plugin/marketplace.json. Users can now add morluto/rea as a
marketplace and install the plugin without waiting for a directory listing.
Release Please bumps the Codex manifest version alongside the Claude one.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>