Replace checkpoint with the Interspeech 2026 paper checkpoint (step 32000); add model card

main previously served the 100k-step run, which does not match the paper. That model is kept at tag step-100k.

README.md

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+---
+license: mit
+tags:
+  - text-to-articulation
+  - articulatory-kinematics
+  - speech-synthesis
+  - sparc
+language:
+  - en
+datasets:
+  - mythicinfinity/libritts_r
+---
+
+# STArK (large) — Interspeech 2026 paper checkpoint
+
+This is the checkpoint used for the results reported in
+**STArK: Towards Synthesizing Articulatory Kinematics from Text** (Xavier Yin, Carlos Busso,
+Interspeech 2026).
+
+- Code: https://github.com/Lab-MSP/STArK
+- Paper (temporary link): https://lab-msp.com/MSP/publications/Yin_2026.pdf
+- Project page: https://lab-msp.github.io/STArK/
+
+## Which checkpoint is this?
+
+| File / revision | Training step | Notes |
+|---|---|---|
+| `checkpoint.ckpt` on `main` (tag `paper-step-32k`) | 32,000 | **Paper checkpoint.** `model=large_model train=train_large`, LibriTTS-R `train-clean-100`. |
+| `checkpoint.ckpt` at tag `step-100k` | 100,000 | Longer, separate training run. Published here from 2026-08-23 to 2026-11-05. It does **not** match the paper's reported results. |
+
+`main` served the 100k-step checkpoint until 2026-11-05. If you downloaded this model before
+that date, you have the 100k-step model, not the paper model. Re-download to get the paper
+checkpoint.
+
+SHA-256 of the paper checkpoint (`checkpoint.ckpt` on `main`):
+`1a704e045295e90c182001543b7fe0e2cb1fcb6fc9519a932e2bcb2da2dac5f3`
+
+## Usage
+
+```bash
+git clone https://github.com/Lab-MSP/STArK && cd STArK && uv sync
+python scripts/stark_cli.py synthesize "Hello, this is a test." \
+    --reference-audio my_voice.wav --output out.wav
+```
+
+The CLI downloads `checkpoint.ckpt` from this repo's `main` branch by default.
+
+To load the 100k-step run instead:
+
+```python
+from huggingface_hub import hf_hub_download
+path = hf_hub_download("Lab-MSP/stark-large", "checkpoint.ckpt", revision="step-100k")
+```
+
+Then pass `--checkpoint <path>` to `stark_cli.py`.
+
+## Citation
+
+```bibtex
+@inproceedings{yin2026stark,
+  title     = {{STArK}: Towards Synthesizing Articulatory Kinematics from Text},
+  author    = {Yin, Xavier and Busso, Carlos},
+  booktitle = {Proc. Interspeech 2026},
+  year      = {2026}
+}
+```
+
+STArK resynthesizes speech with the SPARC vocoder; please also cite SPARC
+(Cho et al., "Coding Speech through Vocal Tract Kinematics", IEEE JSTSP 2024).

checkpoint.ckpt

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