Remove dead code: unused getCurrentBranch() and applyDiff() exports

[that-github-user]

Summary

Two exported functions in src/utils/git.ts are never imported or used anywhere:

• getCurrentBranch() (line 14) — exported but never called
• applyDiff() (line 88) — exported but never called; apply.ts reimplements diff application inline

Action

Remove both functions, or refactor apply.ts to use applyDiff() and delete getCurrentBranch().

[that-github-user]

Fixed in #40. Removed unused getCurrentBranch() and applyDiff() exports from git.ts. Neither was imported anywhere. applyDiff had a dynamic import anti-pattern; apply.ts uses its own inline implementation.