Hwaro::WindowsPaths
hwaro turns file paths into URLs, output paths and cache keys as
/-separated strings ("/" + Path[f].relative_to("content").to_s,
File.join(output_dir, url), …). On Windows the stdlib builds those paths
with \, which leaked into generated links and broke every comparison
against a / path.
Rather than route ~400 call sites through a helper, the path-producing
stdlib methods return / on Windows: Path#to_s (which File.join and
File.expand_path go through) and Dir.current. Every Windows file API
accepts /, and \ can't appear in a Windows file name, so the swap is
lossless. Compiled out everywhere else.