Function prepare_action_effects 

fn prepare_action_effects(
    app: &AppRuntime,
    root: &mut Value,
    action: &Value,
    transition: Option<&Value>,
    integrations_root: &Value,
    request: &HttpRequest,
    input_overrides: &BTreeMap<String, Option<String>>,
    action_id: &str,
    anchor_record_id: i64,
) -> Result<(String, i64, i64, i64, i64, i64), i32>

Prepares declared effects in memory so their persistence shares the domain transaction. It performs no network request or local-file write.