Find screenplay elements whose text contains the query (case-insensitive substring), in script order. Each match has elementId, type, the containing sceneId and sceneLabel (null outside any scene, e.g. title page or episode/act headings) and a ~160-character snippet around the match. Filter with types (e.g. ["DIALOGUE", "CHARACTER"]). truncated is true when more matches exist than limit. Use get_scene with the sceneId to read the full scene.