README title was misleading (# molecule_plugin) and the file only documented
molecule_plugin while completely omitting molecule_agent. Users landing on the
PyPI page had no indication that a remote-agent client was included.
New README structure:
- Covers both packages with a quick-reference table at the top
- Full molecule_agent quick-start (RemoteAgentClient, A2A delegation,
two delivery paths, plugin install)
- molecule_plugin section kept with existing content
- Both-packages section for shared conventions
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>