Merge branch 'main' into feat/language-annotation-pipeline

Resolves conflicts from 32 commits on main:

* docs/source/_toctree.yml — keep both new toc entries
  (annotation_pipeline + video_encoding_parameters).
* docs/source/language_and_recipes.mdx — adopt main's section
  ordering (Layer 2 before "Temporal semantics") and float32
  timestamp dtype to match the codebase.
* src/lerobot/configs/__init__.py — keep both export sets
  (recipe + video encoder).
* src/lerobot/datasets/dataset_metadata.py — drop redundant lazy
  imports (top-level imports cover both LANGUAGE_COLUMNS and
  DEFAULT_TOOLS); adopt main's @tools.setter for info.json
  write-back.
* src/lerobot/datasets/feature_utils.py — call the real
  validate_feature_language() instead of returning "".
* src/lerobot/datasets/language.py — float32 timestamps to match
  pa.float32() used in video_utils.py and the rest of the codebase.
* src/lerobot/datasets/language_render.py — adopt main's
  unwrap_scalar() helper (drops two hand-rolled .item()/list
  unwrappers); float32 in docstring.
* src/lerobot/processor/render_messages_processor.py — drop
  PR-local _scalar() helper, use shared unwrap_scalar().
* tests/datasets/test_language.py — adopt main's new float32 dtype
  + validate_feature_language warning tests.
* tests/datasets/test_dataset_metadata.py — adopt main's new
  tools.setter persist/clear tests.
* uv.lock — regenerated cleanly from main's resolver.

90 of 92 touched tests pass. Two pre-existing test failures
(test_module1_plan_memory_subtask_smoke,
test_module2_mid_episode_emits_paired_interjection_and_speech in
tests/annotations/test_modules.py) are unrelated to this merge —
that test file doesn't exist on main, so the failures originate on
the branch and are addressed by the 8 newer fix(annotate) commits
already on origin that will land in a follow-up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/source/_toctree.yml

@@ -3,12 +3,14 @@
     title: LeRobot
   - local: installation
     title: Installation
+  - local: cheat-sheet
+    title: Cheat sheet
   title: Get started
 - sections:
   - local: il_robots
     title: Imitation Learning for Robots
   - local: bring_your_own_policies
-    title: Bring Your Own Policies
+    title: Adding a Policy
   - local: integrate_hardware
     title: Bring Your Own Hardware
   - local: hilserl
@@ -24,6 +26,12 @@
   - local: rename_map
     title: Using Rename Map and Empty Cameras
   title: "Tutorials"
+- sections:
+  - local: hardware_guide
+    title: Compute Hardware Guide
+  - local: torch_accelerators
+    title: PyTorch accelerators
+  title: "Compute & Hardware"
 - sections:
   - local: lerobot-dataset-v3
     title: Using LeRobotDataset
@@ -37,6 +45,8 @@
     title: Tools
   - local: annotation_pipeline
     title: Annotation Pipeline
+  - local: video_encoding_parameters
+    title: Video encoding parameters
   - local: streaming_video_encoding
     title: Streaming Video Encoding
   title: "Datasets"
@@ -137,6 +147,8 @@
     title: OMX
   - local: openarm
     title: OpenArm
+  - local: rebot_b601
+    title: reBot B601-DM
   title: "Robots"
 - sections:
   - local: phone_teleop
@@ -146,10 +158,6 @@
   - local: cameras
     title: Cameras
   title: "Sensors"
-- sections:
-  - local: torch_accelerators
-    title: PyTorch accelerators
-  title: "Supported Hardware"
 - sections:
   - local: notebooks
     title: Notebooks