Function socket_path 

pub fn socket_path(config: &Config) -> PathBuf

Resolve the local-IPC endpoint path.

Returns $ZEROCLAW_SOCKET when set, otherwise a per-data_dir platform-native endpoint:

• Unix: <data_dir>/daemon.sock (filesystem path)
• Windows: \\.\pipe\zeroclaw-<hash> where <hash> is derived from data_dir so each data directory gets its own pipe