chore(gitignore): ignore .claude/ local settings and skill symlinks

.claude/ holds this machine's Claude Code settings.local.json and the
.claude/skills/* symlinks into .agents/skills; neither belongs in the repo.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff

.gitignore

@@ -35,3 +35,6 @@ build/
 .idea/
 *.iml
 ephemeral/
+
+# Claude Code 로컬 설정 및 스킬 심볼릭 링크
+.claude/