Remove machine-local checkpoint provenance

Remove private filesystem paths from checkpoint metadata and bind policies to the clean CS-VAE container. Tensor values, training steps and model semantics are preserved.

policy.pt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:839b876897aad108fdd29ed5a8969e10feafce23d36159fd7edb3617cc8744ed
-size 12045440854
+oid sha256:c02a1997b0e5cb6c3a5d0ff1b1be5cec00f560c97b46c95a8f9ad6e2bed76885
+size 12045440150