Add FLUX Attribution Notice (License §3.b)

NOTICE.md

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+# NOTICE — FLUX.2-klein-9B redistribution
+
+This repository (`partridge-systems/Flux2Klein`) redistributes the
+FLUX.2-klein-9B model weights from
+[`black-forest-labs/FLUX.2-klein-9B`](https://huggingface.co/black-forest-labs/FLUX.2-klein-9B)
+for **research purposes only**.
+
+## Attribution Notice (required by FLUX Non-Commercial License v2.1, §3.b)
+
+> This FLUX Model is licensed by Black Forest Labs Inc. under the FLUX
+> Non-Commercial License. Copyright Black Forest Labs Inc. IN NO EVENT SHALL
+> BLACK FOREST LABS INC. 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 USE OF THIS MODEL.
+
+The weights are unmodified. The wrapping `Flux2Klein` SDK class
+(`flux2_klein.py`) is original work by partridge-systems and does not
+constitute a Derivative of the FLUX Model under the License.
+
+## Use restrictions (FLUX Non-Commercial License v2.1, §2.b and §4)
+
+This redistribution is solely for **non-commercial research, testing, and
+evaluation in a non-production environment**.
+
+The following are **prohibited** and not granted by accessing this repository:
+
+- Commercial or production use
+- Military use
+- Surveillance (including R&D for surveillance)
+- Biometric processing
+- Generation of unlawful content
+
+If you require a commercial license, contact Black Forest Labs:
+<https://bfl.ai/licensing>.
+
+## Full license
+
+See `LICENSE.md` in this repository.