pub fn resolve_key() -> Result<SecretString, String>Expand description
Resolve the secret key, checking in order:
MURK_KEYenv var (explicit key)MURK_KEY_FILEenv var (path to key file)~/.config/murk/keys/<vault-hash>(automatic lookup for default vault).envfile in cwd (backward compat)
Returns the key wrapped in SecretString so it is zeroized on drop.