Move geometry

Store fixed geometry under model.geometry. Tensor values and dtypes are unchanged; checked local forecasts and checkpoint roundtrips.

model.safetensors

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:18c10ad055d87f6aa694ecd452047ce7817da9633762ba70d2fd46ff306fac4a
-size 139648
+oid sha256:21480fcd5d25ca9272625b6441a0fbdd907db32979469926ac18f75448711784
+size 139728