feat(lekiwi): support LeKiwi in the rollout/eval CLI (#3742)

* feat(lekiwi): support LeKiwi in the rollout/eval CLI

Register the lekiwi robot in lerobot_rollout.py so policies can be rolled out
on a LeKiwi, and keep base-velocity (.vel) features in build_rollout_context.

LeKiwi's observation.state and action are 9-dim (6 arm .pos + x/y/theta.vel)
and the policy is normalized on all 9. The old filter kept only .pos features,
so it fed a 6-dim vector into a 9-dim normalizer (RuntimeError, size 6 vs 9) and
silently dropped the base velocities from the action, leaving the base unable to
move. Keeping both .pos and .vel fixes both. Pure-arm robots have no .vel keys,
so this is a no-op for them.

* style: format LeKiwi rollout action features

---------

Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>
Co-authored-by: Steven Palma <steven.palma@huggingface.co>

src/lerobot/rollout/context.py

@@ -294,12 +294,22 @@ def build_rollout_context(
     # ``observation_features`` values are either a tuple (camera shape) or the
     # ``float`` type itself used as a sentinel for scalar motor features —
     # see ``dict[str, type | tuple]`` annotation on ``Robot.observation_features``.
+    # Keep cameras (tuple) plus both joint-position (.pos) and base-velocity (.vel)
+    # scalar state features. LeKiwi's observation.state is 9-dim (6 arm .pos +
+    # x/y/theta.vel) and the policy was trained/normalized on all 9; the old .pos-only
+    # filter fed a 6-dim state into a 9-dim normalizer → RuntimeError (size 6 vs 9).
+    # Pure-arm robots have no .vel state keys, so this is a no-op for them.
     observation_features_hw = {
         k: v
         for k, v in all_obs_features.items()
-        if isinstance(v, tuple) or (v is float and k.endswith(".pos"))
+        if isinstance(v, tuple) or (v is float and k.endswith((".pos", ".vel")))
     }
-    action_features_hw = {k: v for k, v in robot.action_features.items() if k.endswith(".pos")}
+    # Keep both joint-position (.pos) and base-velocity (.vel) action features so
+    # mobile manipulators command the base too (e.g. LeKiwi: 6 arm .pos +
+    # x/y/theta.vel = 9-dim action). Pure-arm robots have no .vel keys, so this is
+    # a no-op for them. Without the .vel keys the base velocities are silently
+    # dropped from dataset_features[ACTION]/ordered_action_keys and the base never moves.
+    action_features_hw = {k: v for k, v in robot.action_features.items() if k.endswith((".pos", ".vel"))}
 
     # The action side is always needed: sync inference reads action names from
     # ``dataset_features[ACTION]`` to map policy tensors back to robot actions.

src/lerobot/scripts/lerobot_rollout.py

@@ -165,6 +165,7 @@ from lerobot.robots import (  # noqa: F401
     earthrover_mini_plus,
     hope_jr,
     koch_follower,
+    lekiwi,
     omx_follower,
     openarm_follower,
     reachy2,