Function publish_package_shims 

pub fn publish_package_shims(
    shims_root: &Path,
    package_name: &str,
    bin_metadata: Option<&str>,
) -> Result<usize>

Publish command shims for the given installed package.

The shim files are created under the managed shims/ root so the caller can keep a single PATH entry instead of exposing package install roots.