The ingest sidecar is an FFmpeg-style EXT-X-BYTERANGE media playlist;
its segments become the extents and 188 becomes the align quantum, so
every storage chunk holds whole TS packets of one segment. The view
renders a playback playlist with plain numbered segment URLs for
clients that do not speak byte-range HLS, and maps ?seq=N to the
segment's extent. Playlist state the generated playlist cannot
reproduce (EXT-X-KEY, MAP, DISCONTINUITY, GAP, I-frame-only) is
rejected at ingest.