A synced plugin that cannot be found now comes with a reason

When Claude Code looks for a synced plugin and cannot find it, the error now carries a reason. Examples include:

• the plugin was held back
• a local copy took priority
• the plugin was not in the listing

The hint shown when a plugin manifest (the file describing the plugin) fails validation has also changed. It used to say only to check that the file follows the required schema. It now explains that a manifest is read only when it is confirmed to be inside the plugin's own folder, which covers refusals caused by symbolic links (shortcuts to files elsewhere).