User side: the root README and user guide now say in plain language that
every plugin is built against the same rules so plugins can be installed
and used together, like a phone app store. Developer content in the
plugin-ecosystem section moves under a 'For developers' subsection.
Developer side: plugin-development ends with the ecosystem vision —
composition-first, clear declarations, compatibility-first conventions,
adopted through community use, with the marketplace as the discovery and
trust signal. No internal criticism or product comparison is voiced.