chore(dependencies): update uv.lock

placo pulls in pin (Pinocchio), whose binary wheels dlopen specific cmeel
sonames (liburdfdom_sensor.so.4.0, libtinyxml2.so.10) but declare only `>=`
floors on their cmeel packages. The 2026-05-21 major bumps (cmeel-urdfdom
6.0.0 -> .so.6, cmeel-tinyxml2 11.0.0 -> .so.11) ship newer sonames, so left
unpinned the resolver grabs them and `import placo` fails at load with
"liburdfdom_sensor.so.4.0: cannot open shared object file".

#3647 capped placo and hardened the kinematics import, but the guard only
defers the failure: constructing RobotKinematics still raises. Pin the cmeel
packages to the 4.x / 10.x ABI the placo/pin wheels are built against (there
is no cmeel-urdfdom 5.x; <5 selects 4.x). Regenerated uv.lock with uv 0.8.0
to match CI; the only resolution change is the two cmeel versions (plus a
deterministic decord platform-marker cascade from 4.0.1's wider wheel set).

Fixes #3755

docs/source/pi0fast.mdx

@@ -96,7 +96,7 @@ lerobot-train \
     --policy.type=pi0_fast \
     --output_dir=./outputs/pi0fast_training \
     --job_name=pi0fast_training \
-    --policy.pretrained_path=lerobot/pi0_fast_base \
+    --policy.pretrained_path=lerobot/pi0fast-base \
     --policy.dtype=bfloat16 \
     --policy.gradient_checkpointing=true \
     --policy.chunk_size=10 \
@@ -187,7 +187,7 @@ lerobot-train \
   --dataset.repo_id=lerobot/libero \
   --output_dir=outputs/libero_pi0fast \
   --job_name=libero_pi0fast \
-  --policy.path=lerobot/pi0fast_base \
+  --policy.path=lerobot/pi0fast-base \
   --policy.dtype=bfloat16 \
   --steps=100000 \
   --save_freq=20000 \

pyproject.toml

@@ -140,7 +140,14 @@ av-dep = ["av>=15.0.0,<16.0.0"]
 pygame-dep = ["pygame>=2.5.1,<2.7.0"]
 # NOTE: 0.9.16 links against liburdfdom_sensor.so.4, which is unavailable on Ubuntu 24.04
 # (noble ships urdfdom 3.x). Cap below 0.9.16 until system urdfdom 4.x is broadly available.
-placo-dep = ["placo>=0.9.6,<0.9.16"]
+#
+# NOTE: placo pulls in pin (Pinocchio), whose binary wheels dlopen specific cmeel sonames
+# (liburdfdom_sensor.so.4.0, libtinyxml2.so.10) but declare only `>=` floors on their cmeel
+# packages. The 2026-05-21 major bumps (cmeel-urdfdom 6.0.0 -> .so.6, cmeel-tinyxml2 11.0.0
+# -> .so.11) ship newer sonames, so left unpinned the resolver grabs them and `import placo`
+# fails at load with "liburdfdom_sensor.so.4.0: cannot open shared object file" (see #3755).
+# There is no cmeel-urdfdom 5.x; <5 selects the 4.x ABI the placo/pin wheels are built against.
+placo-dep = ["placo>=0.9.6,<0.9.16", "cmeel-urdfdom>=4,<5", "cmeel-tinyxml2<11"]
 transformers-dep = ["transformers>=5.4.0,<5.6.0"]
 grpcio-dep = ["grpcio>=1.73.1,<2.0.0", "protobuf>=6.31.1,<8.0.0"]
 accelerate-dep = ["accelerate>=1.14.0,<2.0.0"]