Add NOTICE (model card, license, third-party IP notice)

NOTICE

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+================================================================================
+ReactiveGWM-Models — Third-Party IP Notice
+================================================================================
+
+This model release is distributed under CC BY-NC 4.0 (see `LICENSE`) for
+the original contributions of the model author. Those original
+contributions do NOT include the underlying video-game IP that the
+training data was derived from, nor any Capcom IP that the models can
+reproduce in their generated outputs. This NOTICE file enumerates the
+third-party intellectual property implicated by this release and the
+conditions under which the weights are made available.
+
+
+1. Source games (training data origin)
+--------------------------------------------------------------------------------
+
+The weights under `SF2/*.safetensors` were trained on short rollouts of:
+
+    Street Fighter II: Champion Edition
+    Platform: Sega Genesis / Mega Drive
+    © Capcom Co., Ltd. All rights reserved.
+
+The weights under `SF3/*.safetensors` were trained on short rollouts of:
+
+    Street Fighter III: New Generation / Street Fighter III: 3rd Strike
+    Platform: Capcom CPS-3 arcade hardware
+    © Capcom Co., Ltd. All rights reserved.
+
+"Street Fighter", the Street Fighter logo, and all character names,
+designs, sprites, backgrounds, music, and sound effects that appear in
+the training rollouts — and that the models may reproduce in their
+generated frames — are trademarks and/or copyrighted works of
+Capcom Co., Ltd.
+
+
+2. No transfer of rights
+--------------------------------------------------------------------------------
+
+Nothing in this model release, in its `LICENSE`, in its `README.md`, or
+in any accompanying file, shall be construed as:
+
+  - a transfer of, or a license to, any Capcom intellectual property;
+  - an endorsement of these models by Capcom Co., Ltd.;
+  - an affiliation between the model author and Capcom Co., Ltd.
+
+The model author is an independent academic researcher with no
+relationship to Capcom Co., Ltd.
+
+
+3. Basis for inclusion
+--------------------------------------------------------------------------------
+
+The weights — and indirectly, the Capcom-derived visual content they
+encode — are released solely for the purpose of academic, non-commercial
+research into:
+
+  - generative video world models,
+  - video-language alignment and action grounding,
+  - behaviour cloning and offline reinforcement learning,
+  - reactive agent modelling on discrete-action domains.
+
+This use is asserted under applicable fair-use / fair-dealing doctrines
+(e.g. 17 U.S.C. § 107 in the United States, and analogous research and
+private-study exceptions in other jurisdictions). It is the user's
+responsibility to ensure that their downstream use also qualifies under
+the law of their jurisdiction.
+
+
+4. What is NOT included
+--------------------------------------------------------------------------------
+
+This repository does NOT contain, and the model author will NOT provide:
+
+  - Sega Genesis or CPS-3 game ROMs;
+  - any BIOS image required to run those ROMs;
+  - emulator binaries;
+  - reverse-engineered game source code;
+  - the raw video frames or audio extracted from the source games (those
+    live in the companion `ReactiveGWM-Datasets` release, under the same
+    non-commercial constraints).
+
+Anyone wishing to retrain or reproduce these weights using the companion
+`SF_ENGINE` code must obtain legal copies of the original games and any
+required BIOS from their own legitimate sources.
+
+
+5. Prohibited uses
+--------------------------------------------------------------------------------
+
+The following uses are explicitly NOT permitted under this NOTICE, the
+LICENSE, or any fair-use claim asserted herein:
+
+  - Commercial use of the weights, of generated outputs from the weights,
+    or of any model derived from / fine-tuned on these weights.
+  - Redistribution of the weights bundled with game ROMs, BIOS files, or
+    emulator binaries.
+  - Use of the models to reproduce, recreate, clone, or compete with any
+    Capcom game, in whole or in part — including using generated frames
+    as assets for a derivative game or interactive product.
+  - Use in any product, service, or publication that disparages Capcom
+    Co., Ltd. or its properties.
+
+
+6. Takedown / rights-holder contact
+--------------------------------------------------------------------------------
+
+If you are a rights holder — in particular Capcom Co., Ltd. or an
+authorised representative — and you believe that any material in this
+release, or any content these models reproduce, infringes your rights,
+please contact the model maintainer:
+
+    Maintainer : Zeqing Wang
+    E-mail     : zeqing.wang@u.nus.edu
+    Repository : https://huggingface.co/INV-WZQ/ReactiveGWM-Models
+
+Please include:
+
+  - a description of the copyrighted work or trademark at issue,
+  - the specific files in this repository that are alleged to infringe,
+  - your contact information,
+  - a statement of your authority to act on behalf of the rights holder.
+
+The maintainer commits to responding within a reasonable timeframe and,
+where the claim is substantiated, to removing or restricting access to
+the contested material promptly.
+
+
+7. Companion software and dataset
+--------------------------------------------------------------------------------
+
+The training data (`ReactiveGWM-Datasets`) and the data-generation /
+training pipeline (`SF_ENGINE`) live in separate repositories and are
+licensed independently — the dataset under CC BY-NC 4.0 with the same
+third-party IP carve-out as this release, and any patches to third-party
+emulators distributed alongside `SF_ENGINE` remain subject to their
+original upstream licenses (typically GPL-compatible licenses for
+stable-retro / FBNeo). See those repositories for details.
+
+
+================================================================================
+Last updated: 2026-05-13
+================================================================================