README: document v2 edge-pad-fixed bundles

README.md

@@ -112,6 +112,29 @@ https://github.com/FluidInference/FluidAudio/tree/main/Sources/FluidAudio/TTS/Su
 - **Precision**: FP16 weights and activations (mlprogram, iOS 18+ minimum deployment target).
 - **Granularity**: vocoder frame ≈ 11.6 ms; latent tick ≈ 69.7 ms.
 
+## v2 bundles (2026-10-07)
+
+`TextEncoder_v2`, `DurationPredictor_v2`, `VectorEstimator_v2` and every
+`VectorEstimatorVariants/VectorEstimator_v2_*` build fix a padding leak in v1.
+
+Upstream's ConvNeXt convs pad both sides with edge (replicate) padding. The
+Core ML pipeline right-pads text to T=128 and the ANE latent buckets to
+L=128/256/512, so in v1 the last valid frame saw padded zeros. The result was
+audible energy in the last ~250 ms of most chunks, plus small duration and
+text-embedding drift.
+
+v2 fills padded frames with the last valid frame before each such conv.
+Inputs, outputs, sizes and ANE placement are the same as v1. Measured against
+unpadded ONNX on the ANE L128 bucket:
+
+- Spectral SNR: 1.0 dB (v1 int4) → 25.4 dB (v2 fp16)
+- Chunk-tail energy: −47 dB → −79 dB, which matches ONNX
+- Speed: unchanged
+
+`Vocoder` pads on the left only, so it's unaffected and keeps its name. The v1
+files remain for older FluidAudio releases; FluidAudio ≥ the release with PR
+#1002 loads v2.
+
 ## Supported Languages
 
 English, Korean, Japanese, Arabic, Bulgarian, Czech, Danish, German, Greek,