Add PerTh implicit watermarker (converted from MIT resemble-perth 1.0.1) + LICENSE + provenance README (sc-13443)

LICENSE

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+MIT License
+
+Copyright (c) 2025 Resemble AI
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+---
+license: mit
+tags:
+  - watermarking
+  - audio
+  - safetensors
+library_name: safetensors
+---
+
+# perth-implicit
+
+A converted **safetensors** mirror of Resemble AI's **PerTh** implicit neural watermarker
+(`PerthImplicitWatermarker` / PerthNet — the `perth_net_250000.pth.tar` "implicit" run) from the
+MIT-licensed [`resemble-perth`](https://github.com/resemble-ai/Perth) package, version **1.0.1**.
+
+This repository is a redistribution mirror published by **SceneWorks** so the weights can be resolved
+by an immutable commit SHA. It exists to serve SceneWorks Inference's native-candle PerTh watermarker
+(`candle-audio-chatterbox`, `crate::perth`), which applies provenance watermarking to Chatterbox
+voice-clone output. It is **not** an official Resemble AI distribution.
+
+## Contents
+
+- `perth_implicit.safetensors` — the encoder + decoder convolution weights, 56 tensors, `float32`.
+  The original checkpoint's `ap.*` STFT window buffers are **omitted** because they are recomputable
+  constants (the consuming Rust port recomputes the Hann window).
+  - `sha256`: `5fc2f30f327b1ba4b3ed760b9e0e46afff7aa6eb73681b1b8a8154d7768346db`
+- `LICENSE` — the upstream MIT license, preserved verbatim.
+
+## Provenance
+
+- **Source**: `resemble-perth` 1.0.1 → `perth/perth_net/pretrained/implicit/perth_net_250000.pth.tar`
+- **Conversion**: `scripts/audio/convert_perth_watermarker.py` (a torch-free converter) in the
+  SceneWorks Inference repository. The conversion copies the raw float32 conv storages verbatim.
+- **Upstream project**: https://github.com/resemble-ai/Perth
+
+## License
+
+**MIT** — Copyright (c) 2025 Resemble AI. See `LICENSE`. This mirror preserves the upstream license
+unchanged; all rights and attribution remain with Resemble AI.

perth_implicit.safetensors

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+oid sha256:5fc2f30f327b1ba4b3ed760b9e0e46afff7aa6eb73681b1b8a8154d7768346db
+size 37392704