Function bundled_mcp_server_path 

pub fn bundled_mcp_server_path() -> PathBuf

Canonical location MUR keeps its own copy of the MCP server binary: ~/.mur/mcp-servers/mur-mcp-server (honors $MUR_HOME). Stable across how mur itself was installed (brew / cargo / source) and across upgrades, so agent profiles can pin this path once and never go stale.