Status of a background job started by a job-returning tool (generate_voiceover, verify_timeline): {state: queued|running|done|failed, progress: 0-1, detail, ...result fields such as mediaRef when done; verify_timeline puts its report in result}. Poll every few seconds while state is 'queued' or 'running' (queued = waiting for the analysis master tab, which loads the models once for the whole browser). For analysis started by start_transcription or start_visual_indexing, poll get_analysis_status instead.