Tighten LHDC v5 config validation and keep the codec encoder-only: do not add unsupported decode, delay query, or PipeWire-side ABR behavior.
Advertise the LHDC v5 sample rates and S16/S24 formats supported by liblhdcv5, parse the P7 bitrate range from peer capabilities, and initialize liblhdcv5 with the selected min/max bitrate indices. Keep fixed quality choices limited to the currently negotiable local max.