chore: gitignore Obsidian/Claudian 볼트 루트(content/) 추가

[CaesiumY]

Description

단수 content/(Obsidian/Claudian 볼트, git 미추적 노트 사본)가 untracked로 ~140개 노출되어 (1) git status/IDE 노이즈, (2) git add -A 시 볼트 전체가 커밋될 footgun을 유발했습니다. 이 볼트는 앞선 블로그 유실 사고(경로 혼동 content/ vs contents/)의 당사자이기도 합니다. 루트 고정 /content/로 볼트만 무시합니다.

⚠️ 안전: 블로그는 무시되지 않습니다

• contents/(복수, s 있음) = 실제 블로그 게시글(Astro 빌드 대상). 무시 대상 아님, 그대로 유지.
• content/(단수, s 없음) = Obsidian 볼트(별도 사본, git 추적 0개). 이것만 무시.
• /content/는 이름이 정확히 content인 디렉터리만 매칭 → contents(다른 이름)는 매칭 불가.

검증: git check-ignore content/blog = 매칭, contents/blog = 매칭 없음, contents/blog/*.md 64개 유지.

Types of changes

• Others (repo 위생: .gitignore)

Checklist

• Breaking Change

[gemini-code-assist]

Code Review

This pull request updates the .gitignore file to ignore the /content/ directory, which is used as an Obsidian/Claudian vault root, while ensuring the actual blog directory contents/ is not ignored. There are no review comments, and I have no feedback to provide.

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[claude]

Review

Small, well-scoped change — .gitignore diff only, 2 lines added.

Correctness

• Verified the anchoring claim: /content/ is root-anchored (leading /) and directory-only (trailing /). Git's gitignore matching is component-exact, not prefix-based, so this pattern matches only a top-level directory literally named content and does not match contents/ (confirmed no accidental prefix overlap).
• git ls-files | grep '^content/' returns 0 — no currently-tracked files live under content/, so this is purely a "stop showing untracked noise" change with no risk of silently un-tracking real content.
• Grepped astro.config.ts / content.config.ts / build scripts for any reference to a root content/ path — none found, so no build-time dependency on that directory.

Code quality

• Follows the existing style in the file: inline Korean comment explaining why, consistent with the .obsidian//.claudian/ entries directly above it. Good placement (grouped with the related vault-ignoring entries).
• The comment explicitly calls out the singular/plural distinction with a ⚠️, which is valuable given the PR description mentions a prior incident of content/ vs contents/ path confusion — this guards future readers from repeating that mistake.

Bugs / Security / Performance

• None applicable — this is a repo-hygiene-only change (ignore rule), no runtime code touched.
• Arguably a minor positive for privacy/security: prevents accidentally staging personal Obsidian vault notes via git add -A.

Test coverage

• N/A for a .gitignore-only change; no existing test would exercise this. The PR description's manual verification steps (git check-ignore content/blog matches, contents/blog doesn't, 64 blog .md files unaffected) are sufficient evidence here.

No blocking issues. LGTM.