Belief/Trade reorg: move legacy aux files into metadata

.gitattributes

@@ -69,3 +69,4 @@ Belief/benchmark_profile/state/validation_rows.jsonl filter=lfs diff=lfs merge=l
 legacy/v1/v1_profilegen/state/train_rows.jsonl filter=lfs diff=lfs merge=lfs -text
 legacy/v1/v1_profilegen/state/validation_rows.jsonl filter=lfs diff=lfs merge=lfs -text
 Belief/metadata/profile_state_train_rows.jsonl filter=lfs diff=lfs merge=lfs -text
+Belief/metadata/profile_state_validation_rows.jsonl filter=lfs diff=lfs merge=lfs -text

Belief/metadata/profile_state_validation_rows.jsonl

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5f0d5ab97f0543190df6fbda5f4ca0296b7249ff86a9224693626fdb615158c8
+size 79702913