The doctor command reported "unknown" for the plugin version whenever the
package was installed somewhere outside the config dir or XDG cache dir
(for example, when running via `bunx oh-my-openagent`, which keeps the
plugin in its own ephemeral cache). The existing scan only checked
`node_modules/<package>/package.json` under those two well-known
directories, so it silently returned a null `loadedVersion`.
Add a `require.resolve("<pkg>/package.json")` fallback that uses Node's
own module resolution to locate whichever copy of the plugin is actually
loaded. The fallback only runs when neither candidate path exists, so
existing behavior is preserved for the common case.
Closes#3822
PeterPonyu
78ae240206