matthew
415293ecd0
The SectorSource/Sink agent and the WritebackFile-rename agent both branched from main concurrently; the sector branch wrote against the 0.17 Writer name and only the rename branch knew about WritebackFile. This integration commit reconciles the two: FileSectorSink::create / ::open / the inner-field type all use WritebackFile directly, and the module-level + struct-level docs are corrected.