Compress baked PNGs and tighten XPbr shadows with URP quality tweaks.

Add png_compress to the model pipeline and update TownSquare lighting plus MaleExplorer/plaza textures.

Co-authored-by: Cursor <cursoragent@cursor.com>

Tools/model_tools/tests/test_png_compress.py

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+import os
+import sys
+import tempfile
+import unittest
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+from png_compress import compress_png
+
+
+class CompressPngTests(unittest.TestCase):
+    def test_pixels_unchanged_and_smaller(self):
+        from PIL import Image
+
+        w = h = 64
+        pixels = [(40, 80, 120, 255)] * (w * h)
+        with tempfile.TemporaryDirectory() as d:
+            path = os.path.join(d, "a.png")
+            im = Image.new("RGBA", (w, h))
+            im.putdata(pixels)
+            im.save(path, format="PNG", compress_level=0, optimize=False)
+            before = os.path.getsize(path)
+            src_bytes = list(Image.open(path).getdata())
+            sizes = compress_png(path)
+            after_im = Image.open(path)
+            self.assertEqual(list(after_im.getdata()), src_bytes)
+            self.assertLess(sizes["after"], before)
+            self.assertEqual(sizes["before"], before)
+
+
+if __name__ == "__main__":
+    unittest.main()