Import upstream snapshot d424a0c899f6b33cbd3daeb279913134349c0b63

Upstream: https://github.com/pollen-robotics/microduck_rl
Upstream-Commit: d424a0c899f6b33cbd3daeb279913134349c0b63
Upstream-Branch: develop

scripts/hf/train_hf.py

@@ -0,0 +1,15 @@
+"""Back-compat shim: the submission logic moved to mjlab_microduck.hf_jobs.
+
+Prefer the integrated flag:
+    uv run train <task> <train args...> --hf-jobs [--namespace <ns>] [...]
+
+This script keeps the old invocation working:
+    uv run scripts/hf/train_hf.py <task> [submission flags] <train args...>
+"""
+
+import sys
+
+from mjlab_microduck.hf_jobs import submit
+
+if __name__ == "__main__":
+    sys.exit(submit(sys.argv[1:]))