Standalone Python (stdlib-only) tool that verifies a stream delivers
segments correctly and its delivery queue does not break:
- HLS: EXT-X-MEDIA-SEQUENCE contiguity, no dropped/rewound segments, no
EXT-X-DISCONTINUITY, every newly appearing segment downloadable.
- MPEG-TS: per-PID continuity_counter, sync-byte loss, TEI, delivery stalls,
with a --tolerance for rare source glitches relayed by -c copy.
- --live: colored TUI dashboard modelling a virtual player — received
timeline from PCR (TS) / EXTINF (HLS), playhead, and buffered cache
seconds graphed over time.
Documented in docs/{en,ru}/development/streaming-subsystem.md.
