Function call_builtin_bridge 

pub fn call_builtin_bridge(
    name: &str,
    args: Vec<StringKeyedValue>,
) -> Result<Option<StringKeyedValue>, String>

Call the builtin bridge for a named builtin.

Returns:

• Ok(Some(result)) if the bridge handled the builtin
• Ok(None) if no bridge is installed (caller should error)
• Err(msg) if the bridge returned an error