Add dataset license notice and training attribution draft

LICENSE.md

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+# The Forge Dataset License Notice
+
+Copyright © 2026 TokenAI. All rights reserved in the original materials owned by TokenAI.
+
+## Current license
+
+TokenAI-original materials in The Forge are currently offered under the
+[Creative Commons Attribution 4.0 International license (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/legalcode).
+The license permits sharing and adaptation, including commercial use, subject
+to its attribution and other terms.
+
+The official license deed is available at:
+<https://creativecommons.org/licenses/by/4.0/>
+
+The CC BY 4.0 license requires appropriate credit, a link to the license, and
+an indication of changes. It does not, by itself, clearly require disclosure
+that the dataset was used to train, fine-tune, or evaluate a closed or
+proprietary machine-learning model. CC BY 4.0 also does not permit a licensor
+to add legal or technological restrictions that conflict with the permissions
+it grants.
+
+## Proposed training-use attribution addendum
+
+If a company uses The Forge secretly, it may be difficult to determine that use
+from model performance alone. A practical contractual approach is to require a
+commercial user to disclose the use in the model card or accompanying
+documentation, retain usage records, and provide reasonable evidence of that
+use upon request. This contractual approach does not guarantee automatic
+detection; enforcement depends on evidence of use and applicable law.
+
+The following clause is proposed for a future TokenAI-specific data license:
+
+> **Training Use Attribution.** If you use The Forge Dataset to train,
+> fine-tune, or evaluate a machine-learning model, you must visibly
+> acknowledge “The Forge by TokenAI” and link to the dataset repository in the
+> model card or equivalent documentation accompanying any public release or
+> commercial offering of that model. This obligation applies whether the
+> resulting model is open-weight or proprietary.
+
+This addendum is an initial draft for legal review. It is not presented as an
+additional enforceable restriction under CC BY 4.0. Before relying on the
+clause, TokenAI should publish a separate custom data license that clearly
+defines its scope, acceptance mechanism, commercial-use obligations,
+record-retention requirements, evidence requests, remedies, governing law,
+and the rights and licenses applicable to every third-party component.
+
+## Third-party materials
+
+The license granted by TokenAI applies only to material for which TokenAI has
+the necessary rights to grant permission. Third-party records, annotations,
+artwork, or other components retain their applicable upstream licenses and
+attribution requirements. No third-party material is silently relicensed as
+TokenAI-owned material.
+
+## No legal advice
+
+This notice is informational and is not legal advice. TokenAI should obtain
+qualified legal review before replacing CC BY 4.0 with a custom license or
+making the proposed training-use attribution clause a condition of use.