feat(cli): mcc --version command 보완 - #80
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./mcc --version has never worked - Cobra only registers --version when the root command's Version field is set, and it wasn't, so the flag simply didn't exist (docs telling users to run it as a smoke test always failed with "unknown flag"). Pull the version from the VCS info Go embeds automatically for any build done inside a git checkout (default since Go 1.18, no ldflags or build script changes needed) - the short commit hash, plus "-dirty" if the working tree had uncommitted changes at build time. Falls back to "dev" when build info isn't available (e.g. go run).
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변경 내용
root command에
Version필드를 설정. 빌드 시스템에 ldflags 기반 버전 주입 패턴이 없어서(순수go build/make뿐), 별도 빌드 스크립트 변경 없이 Go 1.18+가 git 체크아웃 내부에서 빌드할 때 자동으로 심어주는 VCS 정보(runtime/debug.ReadBuildInfo())를 런타임에 읽어 사용 — 커밋 해시 12자리 + 워킹트리에 미커밋 변경이 있으면-dirty접미사. 빌드 정보를 못 읽는 환경(go run등)에서는"dev"로 폴백.