feat(hx-cache): support XDG_CONFIG_HOME and XDG_CACHE_HOME - #18
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global_config_dir() and global_cache_dir() currently resolve via ProjectDirs, which follows the platform-native convention (e.g. ~/Library/Application Support on macOS). This adds support for $XDG_CONFIG_HOME/$XDG_CACHE_HOME, respected when set (non-empty), so users who manage dotfiles across Linux and macOS can keep config/cache locations consistent. Falls back to the platform default otherwise, on any platform. toolchain_dir()/toolchain_bin_dir() are unaffected: they already deliberately bypass ProjectDirs for GHC's paths-with-spaces requirement.
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Adds support for
$XDG_CONFIG_HOMEand$XDG_CACHE_HOMEinglobal_config_dir()/global_cache_dir(). These currently resolve viaProjectDirs, following the platform-native convention (e.g.~/Library/Application Supporton macOS); this lets that be overridden when a user sets an XDG var.Falls back to the platform default otherwise.
All green (build, test, clippy, fmt) + 5 new unit tests.