feat(skills): add git-master skill for atomic commits and history management
- Add comprehensive git-master skill for commit, rebase, and history operations - Implements atomic commit strategy with multi-file splitting rules - Includes style detection, branch analysis, and history search capabilities - Provides three modes: COMMIT, REBASE, HISTORY_SEARCH 🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
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