Add per-split LICENSE for the urban split (CC BY-NC 4.0)

data/urban/LICENSE

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+Pano-Infinigen — urban split
+============================
+
+The urban split of Pano-Infinigen is licensed under the Creative Commons
+Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
+
+Full license text: https://creativecommons.org/licenses/by-nc/4.0/legalcode
+
+Why non-commercial
+------------------
+
+The urban split contains renderings of scenes generated with the iCity
+Blender addon (https://superhivemarket.com/products/icity) by Hothifa Smair
+and the Parametra team (https://parametra.net/). The PaGeR Authors hold a
+written authorization from Hothifa Smair to use iCity-derived data for
+non-commercial academic research, to train PaGeR on it, and to release the
+resulting derivative 2D renderings (this urban split) under CC BY-NC 4.0.
+
+The renderings released here are derivative 2D outputs only — no iCity
+source code, geometry-nodes setups, materials, or .blend files are included.
+
+What you may do
+---------------
+
+Subject to the full terms of CC BY-NC 4.0, you may:
+  - Download and use this urban split for academic research, reproducing
+    the PaGeR paper, teaching, and non-commercial demonstrations.
+  - Adapt and remix the data for non-commercial research artifacts.
+  - Redistribute the unmodified urban split provided you (a) attribute
+    iCity, Hothifa Smair, the Parametra team, and the PaGeR Authors, and
+    (b) include a copy of (or link to) this license.
+
+What you may not do
+-------------------
+
+  - Commercial use of the urban split, in whole or in part, including
+    integration into commercial products, paid SaaS services, or any
+    revenue-generating deployment.
+  - Reverse-engineering of the underlying iCity Components from the
+    released renderings.
+
+The other two splits of Pano-Infinigen (indoor, nature) are licensed
+separately under BSD-3-Clause and have no commercial-use restriction; see
+the dataset README for the per-split license overview.