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//! Path resolution for the canonical oxicode home directory.
use PathBuf;
/// Return the canonical `oxicode` home directory.
///
/// Delegates to [`oxicode_ai::product_env::home_dir`] so the leaf library and
/// the SDK share one resolution path. Resolution order (unified Oxi home):
/// 1. `$OXICODE_HOME` environment variable
/// 2. `$OXI_HOME/oxicode`
/// 3. `$HOME/.oxi/oxicode` (or platform equivalent via `dirs`)
///
/// Legacy `~/.oxicode` installs are handled at the reader layer (read-only
/// fallback via `oxicode_ai::oxi_home::read_path`); this function always
/// returns the canonical, write-target home.
///
/// Returns an error if none of the above is available.
/// Ensure a directory exists, creating it (and parents) if missing.
pub async