List items violating one governance file rule

Returns one page of the items that violate a single mandatory-file rule from the business's governance ruleset. Rules are identified by the rule_id carried in each entry of the stats response's seco_missing_files.rules array. Paging is cursor-based: pass the previous response's next_cursor; a null next_cursor is the last page. Returns 404 where the governance dashboard is not enabled, no file rules are configured, or the rule no longer exists.