test: 코덱스 리뷰용 AGENTS.md 생성

Author: opficdev

AGENTS.md

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+## Review Guidelines
+
+- Write all review comments in Korean.
+- Keep review comments concise and high-signal.
+- Prioritize findings about bugs, performance, and readability.
+- Do not explain obvious, trivial, or low-signal issues.
+- When useful, begin the review with a short summary of the main changes.
+- Focus on actionable feedback rather than broad commentary.