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 sha256:939c013247a7a8037288cf0021f49e944ee12855ee915d61506a7f09ea1234d8
-size 12045441636
+oid sha256:43cda0113e2d055b65ccb516a8a3448712589035defb57e5fa4399a6cfaba258
+size 12045441046