Add optional 44.1 kHz X-VC enhancement

experiments/xvc-voice-conversion/README.md

@@ -9,7 +9,7 @@ ZeroGPU.
 - Private URL: `http://192.168.1.212:8009`
 - Source clip: speech content and timing to preserve
 - Reference clip: target speaker identity
-- Output: 16 kHz PCM WAV
+- Output: native 16 kHz PCM WAV plus optional Resemble-Enhance restoration at 44.1 kHz
 - GPU: RTX 5080 only
 - Persistent cache: `/data/voice/xvc/huggingface`
 - Code and model license: MIT
@@ -22,3 +22,9 @@ Technical acceptance on 9 September 2026 used the repository's source and
 target examples: 5.20 seconds were converted in 1.07 seconds (RTF 0.21). The
 result was valid mono PCM WAV at 16 kHz, and the loaded process occupied about
 2.9 GiB on the RTX 5080. German listening quality remains open.
+
+The optional high-quality path uses `resemble-enhance` 0.0.1 with model
+revision `4e3510ce4a8391159f665903544c5150bee7b2cb`. It does not change X-VC's
+native 16-kHz architecture. Instead, it reconstructs missing speech bandwidth
+after conversion and writes a second 44.1-kHz WAV. The UI always retains the
+native output for an honest A/B comparison.