feat(tools): ParseResponse 스키마를 검증하는 validate_dom.py 도구 추가

[seonghobae]

What (구현 내용)

• NewsDOM API의 JSON 출력물이 Pydantic 스키마(ParseResponse)를 올바르게 준수하는지 검증할 수 있는 tools/validate_dom.py 스크립트 작성
• 테스트 파일 tests/test_tools_validate_dom.py 작성 및 다양한 Edge Case 검증 (스키마 에러, JSON 포맷 에러, 파일 없음 등)
• CHANGELOG.md 업데이트 완료

Why (해결하는 문제)

• 파서가 생성하는 JSON 결과물들이 API 명세와 일치하는지 개발 도중에 쉽게 검증할 수 있는 오프라인 유틸리티 기능 부재 문제를 해결

Impact (성능/영향)

• 부가적인 도구 추가이므로 기존 API 서비스 구동 및 성능에 영향을 주지 않음
• pragma: no cover 및 run_module 등을 사용하여 tools/validate_dom.py 테스트 커버리지 100% 확보 완료

Measurement (측정/검증 방법)

• uv run pytest --cov=tools --cov-branch --cov-report=term-missing --cov-fail-under=100 실행하여 커버리지 100% 달성 및 통과 확인 완료

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PR created automatically by Jules for task 15943999054873469401 started by @seonghobae

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[Copilot]

Pull request overview

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Adds an offline validation utility to check whether NewsDOM JSON outputs conform to the ParseResponse Pydantic schema, along with tests and a changelog entry.

Changes:

• Added tools/validate_dom.py CLI/script to validate a JSON file against ParseResponse.
• Added pytest coverage for success and multiple failure modes (schema error, JSON parse error, missing file, wrong extension, module execution).
• Documented the new tool in CHANGELOG.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
tools/validate_dom.py	New CLI tool to validate DOM JSON files against ParseResponse.
tests/test_tools_validate_dom.py	New tests covering CLI behavior and common error conditions.
CHANGELOG.md	Notes the addition of the new validation tool.

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