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

app/core/audio_features.py

@@ -60,7 +60,7 @@ def load(path, sr=None, mono=True, offset=0.0, duration=None):
         from fractions import Fraction
         ratio = Fraction(int(sr), int(file_sr))
         up, down = ratio.numerator, ratio.denominator
-        data = _signal.resample_poly(data, up, down).astype(np.float32)
+        data = _signal.resample_poly(data, up, down, window=("kaiser", 16)).astype(np.float32)
         file_sr = sr
 
     return data, file_sr