Normalize Linux audio pipeline to lossless Float32 (skill: lossless-audio-compliance)

- native bridge WAV writers: 16-bit PCM truncation -> IEEE Float32 (fmt 3, bit-exact)
- vendor sheredom_json.h (vst3sdk 3.8.1 lacks moduleinfo/json.h)
- Dockerfile: drop nonexistent sfizz tag v1.2.3
- Python sf.write -> subtype=FLOAT everywhere
- resample_poly -> kaiser(16) window (>=130dB stopband)
- audio_editor._write_wav_lossless(): FLOAT passthrough, TPDF dither only for
  8/16/24-bit final exports
- app.jsx WAV encoders: Float32 default, TPDF dither for integer depths, fix 24-bit
- tests: lossless compliance gate (null test < -140dBFS, float32 format) 9/9 pass
- TASKS_WINDOWS_AUDIO_NORMALIZE.md: Windows-side remaining tasks

Dockerfile

@@ -46,7 +46,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         cmake pkg-config libfluidsynth-dev libfreetype-dev git \
     && rm -rf /var/lib/apt/lists/* \
     && if [ -d native_bridge/sfizz-src ]; then cp -r native_bridge/sfizz-src /tmp/sfizz; \
-       else git clone --recursive --depth 1 --branch v1.2.3 https://github.com/sfztools/sfizz.git /tmp/sfizz; fi \
+       else git clone --recursive --depth 1 https://github.com/sfztools/sfizz.git /tmp/sfizz; fi \
     && cmake -S /tmp/sfizz -B /tmp/sfizz/build -DCMAKE_BUILD_TYPE=Release \
            -DSFIZZ_SHARED=ON -DSFIZZ_JACK=OFF -DSFIZZ_RENDER=OFF -DSFIZZ_TESTS=OFF \
            -DSFIZZ_BENCHMARKS=OFF -DSFIZZ_DEMOS=OFF -DSFIZZ_DEVTOOLS=OFF \