Prototype pollution via path-keyed directory object

Prototype pollution in tschaub gh-pages before 5.0.0 allows attackers to alter object prototypes via crafted file paths. The uniqueDirs function splits each file path into directory segments and stores partial paths as keys on a plain object, causing prototype-property keys to be handled through Object.prototype instead of as inert directory data. Reachability requires a consuming build or publish workflow to pass attacker-controlled filenames into uniqueDirs; public sources document no demonstrated consequence beyond prototype modification.