docs(rollout): write the API reference docstrings

Wave 4 (training & eval) kickoff: brings src/lerobot/rollout/ to 100% public
docstring coverage, following the standard in docs/source/writing_docstrings.mdx.
Picked as the smallest of the five Wave 4 modules (scripts/envs/rewards/rl/rollout)
to validate the workflow before the larger ones.

- Documents the remaining gaps across configs.py (RolloutConfig, the
  RolloutStrategyConfig hierarchy, DAggerKeyboardConfig/DAggerPedalConfig),
  inference/ (InferenceEngineConfig hierarchy, RTCInferenceEngine.__init__,
  SyncInferenceEngine.__init__), ring_buffer.py, robot_wrapper.py, and every
  strategy's __init__ (core/dagger/episodic/highlight/sentry), converting
  RolloutConfig's and the strategy configs' inline `#` field comments into
  type-annotated Args: blocks and RolloutRingBuffer's numpydoc Parameters
  section into Google-style Args:.
- Also documents two dunder methods (RolloutConfig.__get_path_fields__,
  RolloutRingBuffer.__len__) that a naive "skip all underscore-prefixed
  names" gap scan misses but interrogate's ignore-magic=false requires.
- Removes "src/lerobot/rollout/**" = ["D"] from pyproject.toml's ruff ignore
  list — the whole module is now checked, no deferred internals (unlike the
  policies module, rollout has no per-family split to narrow the scope of).
- Adds lerobot.rollout to check_docstrings.py's MODULES_TO_CHECK ratchet.
- Creates docs/source/api/rollout.mdx from scratch (strategies, inference
  backends, RolloutContext and its sub-contexts, ThreadSafeRobot,
  RolloutRingBuffer) and wires it into _toctree.yml under API Reference.
  Verified via a full doc-builder build — no dead cross-references, no
  leftover placeholder text.
- Ratchets interrogate's fail-under from 55 to 55.5 (measured 55.6% with
  this PR).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/source/_toctree.yml

@@ -215,4 +215,6 @@
     title: Environments
   - local: api/configs
     title: Configuration
+  - local: api/rollout
+    title: Rollout
   title: "API Reference"

docs/source/api/rollout.mdx

@@ -0,0 +1,118 @@
+# Rollout
+
+`lerobot.rollout` is the policy deployment engine behind [`lerobot-rollout`](../inference): it wires up a
+policy, an inference backend, and a pluggable recording strategy, then runs the robot control loop. See
+[Policy Deployment (lerobot-rollout)](../inference) for CLI usage and [Real-Time Chunking (RTC)](../rtc)
+for the async inference backend.
+
+## RolloutConfig
+
+Top-level configuration for the `lerobot-rollout` CLI.
+
+[[autodoc]] lerobot.rollout.RolloutConfig
+
+## Strategies
+
+Strategies implement the control loop and are selected via `--strategy.type=<name>`.
+
+[[autodoc]] lerobot.rollout.RolloutStrategy
+    - setup
+    - run
+    - teardown
+
+[[autodoc]] lerobot.rollout.RolloutStrategyConfig
+
+[[autodoc]] lerobot.rollout.BaseStrategy
+    - all
+
+[[autodoc]] lerobot.rollout.BaseStrategyConfig
+
+[[autodoc]] lerobot.rollout.SentryStrategy
+    - all
+
+[[autodoc]] lerobot.rollout.SentryStrategyConfig
+
+[[autodoc]] lerobot.rollout.HighlightStrategy
+    - all
+
+[[autodoc]] lerobot.rollout.HighlightStrategyConfig
+
+[[autodoc]] lerobot.rollout.EpisodicStrategy
+    - all
+
+[[autodoc]] lerobot.rollout.EpisodicStrategyConfig
+
+[[autodoc]] lerobot.rollout.DAggerStrategy
+    - all
+
+[[autodoc]] lerobot.rollout.DAggerStrategyConfig
+
+[[autodoc]] lerobot.rollout.DAggerKeyboardConfig
+
+[[autodoc]] lerobot.rollout.DAggerPedalConfig
+
+## create_strategy
+
+[[autodoc]] lerobot.rollout.create_strategy
+
+## Inference backends
+
+Inference backends produce actions during the control loop and are selected via
+`--inference.type=<name>`.
+
+[[autodoc]] lerobot.rollout.InferenceEngine
+    - start
+    - stop
+    - reset
+    - get_action
+    - notify_observation
+    - pause
+    - resume
+
+[[autodoc]] lerobot.rollout.InferenceEngineConfig
+
+[[autodoc]] lerobot.rollout.SyncInferenceEngine
+    - all
+
+[[autodoc]] lerobot.rollout.SyncInferenceConfig
+
+[[autodoc]] lerobot.rollout.RTCInferenceEngine
+    - all
+
+[[autodoc]] lerobot.rollout.RTCInferenceConfig
+
+## create_inference_engine
+
+[[autodoc]] lerobot.rollout.create_inference_engine
+
+## build_rollout_context
+
+Wires up policy, processors, hardware, dataset, and inference engine before strategy dispatch.
+
+[[autodoc]] lerobot.rollout.build_rollout_context
+
+## RolloutContext
+
+[[autodoc]] lerobot.rollout.RolloutContext
+
+[[autodoc]] lerobot.rollout.RuntimeContext
+
+[[autodoc]] lerobot.rollout.HardwareContext
+
+[[autodoc]] lerobot.rollout.PolicyContext
+
+[[autodoc]] lerobot.rollout.ProcessorContext
+
+[[autodoc]] lerobot.rollout.DatasetContext
+
+## ThreadSafeRobot
+
+[[autodoc]] lerobot.rollout.robot_wrapper.ThreadSafeRobot
+    - all
+
+## RolloutRingBuffer
+
+Memory-bounded ring buffer used by the Highlight strategy for on-demand recording.
+
+[[autodoc]] lerobot.rollout.ring_buffer.RolloutRingBuffer
+    - all