Capture the plugin manifest version bumps that release:prepare generated for 9.0.0 and update the release staging step so Claude and Codex plugin manifests are included automatically in future release commits.
Document the new Claude Code and Codex plugin distributions and explain how root plugins, bundle plugins, and plugin-safe filtering relate to the full library install.\n\nSync the catalog, plugin compatibility artifacts, and generated plugin-safe subsets so main stays consistent before the v9.0.0 release flow.
Update the Claude marketplace entry to use a schema-valid relative source path and add a regression test so invalid marketplace sources fail in the local suite. Also document the maintainer workflow used for stale PR metadata and fork-gated Actions runs.
Fixes#344
