Add code review agent for GitHub Copilot

[eerxuan]

Add a code review agent configuration at .github/agents/code-review-agent.md that provides automated review guidance based on project conventions.

The agent enforces:

• TEST_FORMAT.md, TEST_COVERAGE.md, and FOLDER_STRUCTURE.md rules
• Strict BSON numeric types in assertions
• Feature ownership (tests in the feature's own folder)
• No cleanup leaks
• Flakiness prevention (ignore_doc_order, no_parallel, replica, engine_xfail markers)
• Documentation update requirements

Signed-off-by: Yunxuan Shi yunxuan@amazon.com

[documentdb-triage-tool]

🤖 Auto-triaged by documentdb-triage-tool.

Applied: documentation, enhancement
Project fields suggested: Component docs · Priority P3 · Effort M · Status Needs Review
Confidence: 0.75 (mixed)

Reasoning

component from path globs (docs); effort from diff stats (129+0 LOC, 1 files); LLM: Adds a single GitHub Copilot code-review agent config file under .github/ — a nice-to-have automation enhancement with no functional code changes.

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