prune: add 'pkh prune' command

src/lib.rs

@@ -15,6 +15,8 @@ pub mod deb;
 pub mod distro_info;
 /// Obtain information about one or multiple packages
 pub mod package_info;
+/// Prune residual pkh build artifacts and caches
+pub mod prune;
 /// Download a source package locally
 pub mod pull;
 /// Handle package-specific quirks and workarounds