Function find_archived_unit 

pub fn find_archived_unit(mana_dir: &Path, id: &str) -> Result<PathBuf, Error>

Find an archived unit by ID within the .mana/archive/ directory tree.

Searches recursively through .mana/archive/**/ for a unit file matching the given ID. Returns the full path to the first matching unit file.

Arguments

• mana_dir - Path to the .mana/ directory
• id - The unit ID to search for

Returns

Ok(PathBuf) with the path to the archived unit file if found Err if the unit is not found in the archive

Examples

let path = find_archived_unit(Path::new(".mana"), "12")?;
// Returns: .mana/archive/2026/01/12-unit-archive-system.md