⚡ Bolt: 데이터 프레임 열 이름 추출 최적화

[seonghobae]

💡 What:
R/aFIPC.R 내부에서 불필요하게 데이터 프레임을 부분 집합(subset)으로 만들어 열(column) 이름을 추출하던 로직(colnames(df[cols]))을 intersect() 함수로 대체하였습니다.
(예: intersect(colnames(df), cols))

🎯 Why:
기존의 df[cols] 방식은 대상 데이터 프레임의 전체 컬럼에 대해 일일이 메모리를 복사하는 과정(O(N) 오버헤드)을 유발하여 성능 저하의 원인이 됩니다.

📊 Impact:

• 데이터 프레임을 전체적으로 다시 할당하는 메모리 복사 오버헤드를 원천적으로 방지합니다.
• 추출 속도가 빨라지며(성능 최적화), df[cols]에서 발생할 수 있는 "undefined columns selected"와 같은 잠재적 오류 위험도 사라집니다.

🔬 Measurement:

• 패키지 내 aFIPC() 관련 모든 단위 테스트를 실행( AFIPC_ENABLE_PACKRAT=true Rscript -e "testthat::test_dir('tests/testthat')" )하여 완벽하게 통과함을 확인했습니다. (모든 기능 정상 동작)

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PR created automatically by Jules for task 3160266560106544557 started by @seonghobae

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• .jules/bolt.md
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✅ Devin Review: No Issues Found

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