pub fn key_file_path(vault_path: &str) -> Result<PathBuf, String>Expand description
Compute the key file path for a vault: ~/.config/murk/keys/<hash>.
The hash is a truncated SHA-256 of the lexical absolute vault path
(cwd-joined if relative, but symlinks are NOT resolved). Using the
literal path is important for security: a symlink .murk pointing at
another project’s vault must not resolve to that project’s key file.