docs: add Cursor Cloud dev setup agent skill

[sanjeed5]

Create an agentskills.io skill for Cursor Cloud dev setup and update AGENTS.md to reference it.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

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[claude]

Claude finished @sanjeed5's task in 52s —— View job

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Review of PR #295: Development environment setup

• Gather context and read changed files
• Review changes against base branch
• Post review feedback

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This is a documentation-only PR adding two new files — a Cursor Cloud dev setup skill and a root AGENTS.md that references it. No SDK source code is affected.

What looks good:

• The quick-reference table in SKILL.md accurately reflects the real tox environments (unit, lint, format) and Makefile targets (check, help) in the repo.
• The tox -e lint description ("pylint + mypy") and tox -e format description ("black + isort") correctly match the actual deps/commands in tox.ini.
• requires-python = ">=3.11" is correctly quoted from pyproject.toml.
• The "Gotchas" section is practical and will save new contributors time.
• No impact on public APIs, type safety, or runtime behavior.

No issues found. The content is accurate and well-structured. LGTM.

[github-actions]

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• Import tests: ✅ All imports working

[sanjeed5]

@claude approve

[sanjeed5]

@dhruv-hhai can you approve?

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[github-actions]

📚 Documentation preview built — Download artifact

Review instructions & validation status

How to Review

1. Download the artifact from the link above
2. Extract the files
3. Open index.html in your browser

Validation Status

• API validation: ✅ Passed
• Build process: ✅ Successful
• Import tests: ✅ All imports working

[github-actions]

📚 Documentation preview built — Download artifact

Review instructions & validation status

How to Review

1. Download the artifact from the link above
2. Extract the files
3. Open index.html in your browser

Validation Status

• API validation: ✅ Passed
• Build process: ✅ Successful
• Import tests: ✅ All imports working