Function assert_additive_settlement_extra 

pub fn assert_additive_settlement_extra(
    extra: &Map<String, Value>,
    enrichment: &Map<String, Value>,
    caller_label: &str,
) -> Result<(), HookPolicyError>

Ensures scheme response enrichment only adds new extra fields, including nested objects.

Errors

HookPolicyError when enrichment would overwrite an existing field.