StreamQA Live-Stream Health Probe

Live-stream health verdict for any HLS (m3u8) playlist URL. Runs three probe cycles: availability, manifest latency, live-window movement, frozen-playlist detection, segment throughput, rebuffer-risk. Input: {"query": "https://.../live.m3u8"}. Output: verdict (healthy/degraded/frozen/unreachable) plus metrics. Designed for LIVE playlists; VOD reports frozen by design.