Function send_text 

pub fn send_text(
    config: &NotifyConfig,
    title: &str,
    body: &str,
) -> Vec<(String, Result<(), String>)>

Send a free-text message (event name “digest”) to every channel whose events list contains “digest” or “*”. Same shape as test_channels: per-channel results for CLI display; channels that do not subscribe get a skip error so the operator sees why nothing arrived.