docs(device): add reBot DevArm leader plugin to the joint-space device page

[johnnynunez]

Description

Documents the reBot DevArm leader plugin (#729) on the Generic Joint-Space Device docs page (docs/source/device/joint_space.rst), as requested by @jiwenc-nv in the #729 review — turning the plugin README into rst mounted under device/joint_space.html.

Changes

• Intro: cite the reBot DevArm leader as a second joint-space device instance next to the SO-101 reference.
• New section "The reBot DevArm leader plugin" (anchor rebot-devarm-leader-plugin), condensing the plugin README: DamiaoBus with no SDK dependency, disable + back-drive leader design, per-cycle 0xCC feedback requests, synthetic fallback, run/probe CLI, probe exit codes (0 / 3) and the volatile multi-turn gripper counter (joint streamed with valid = false while wrapped). Links to the plugin README for the calibration file format.
• "Add another joint-space device": point at src/plugins/rebot_devarm_leader as a worked second example of the recipe.

Notes

• Stacked on Add reBot DevArm leader arm plugin (Damiao dm-serial backend) #729: the :code-file: / :code-dir: links target src/plugins/rebot_devarm_leader, which lands with that PR — this one should merge after it.
• No video embedded yet; a usage video is being recorded (see Add reBot DevArm leader arm plugin (Damiao dm-serial backend) #729 review thread) and can be added here or in a follow-up.

Checklist

• Sphinx build clean: sphinx -b html -W --keep-going → build succeeded, 0 warnings
• SKIP=check-copyright-year pre-commit run clean on the touched file
• DCO sign-off

Summary by CodeRabbit

• Documentation
  • Expanded the Generic Joint-Space Device guide with a second reference hardware example.
  • Added setup and usage details for the reBot DevArm leader, including connection, calibration, probing, and fallback behavior.
  • Clarified gripper handling for out-of-range values and how to recover safely.
  • Updated the “add another device” guidance to reference both supported plugin patterns.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 1bcd747 and 93b0547.

📒 Files selected for processing (1)

• docs/source/device/joint_space.rst

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📝 Walkthrough

Walkthrough

This change updates the joint-space device documentation to add the Seeed reBot DevArm leader as a second reference hardware instance alongside the existing SO-101 leader arm. It introduces a new documentation section describing the rebot_devarm_leader plugin's CAN bus interface, joint decoding, motor disabling for back-drive, synthetic fallback behavior, CLI usage with probe mode, and gripper out-of-range handling. The "Add another joint-space device" recipe instructions are updated to reference either plugin as a template.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding the reBot DevArm leader plugin to the joint-space device documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

⚔️ Resolve merge conflicts

• Resolve merge conflict in branch docs/rebot-devarm-joint-space

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