Function unwrap_container

crates/flowtrace-cli/src/explain.rs:365–374

Transparently unwrap one layer of container indirection (array → items, map → additionalProperties). Returns the element schema if a container, else returns the input unchanged. Used so `explain reply.evidence` shows the Evidence variants directly and `explain state.steps` shows the StepState fields directly.

(rs: &RootSchema, obj: &SchemaObject)

/// the Evidence variants directly and `explain state.steps` shows the
/// StepState fields directly.
fn unwrap_container(rs: &RootSchema, obj: &SchemaObject) -> SchemaObject {
    let s = resolve(rs, obj);
    if let Some(item) = array_item(s) {
        return resolve(rs, item).clone();
    }
    if let Some(value) = map_value(s) {
        return resolve(rs, value).clone();
    }
    s.clone()
}

/// Render a minimal valid JSON example for the schema. Always ends with a newline
/// so the output is line-clean when piped to a file or another command.