pub fn agent_key_file_path(
vault_path: &str,
name: &str,
) -> Result<PathBuf, String>Expand description
Compute the file path for an agent grant key:
~/.config/murk/agent-keys/<vault-hash>-<name>.
Grant keys live in a separate agent-keys/ directory, not in
~/.config/murk/keys/, so they are never surfaced by key auto-discovery
(which only looks up keys/<vault-hash>). The vault hash prefix keeps a
grant named the same across two vaults from colliding.