Replace dense-100m with audited v1.4 (part 2)

Correct alias semantics, canonical fingerprints, parseable renderers, distinct transformations, and manifest-bound audits.

data/dense-100m/validation/part-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c041fb434c6988abdbc44e3a1dbebb58ce8a6e31631781c6d6ba1c950381e03d
-size 103764811
+oid sha256:80efcdbbbcb06b48d5613c63919748350cca2a2a21fa538db8fe4a0d22d077d2
+size 105863199