test(git): add coverage for git_explain.git subprocess wrappers

[nazarli-shabnam]

Summary

• git_explain/git.py (repo-root detection, staged/unstaged/untracked change parsing, rename/copy normalization, diff assembly) had zero test coverage.
• Added tests/test_git.py covering repo-root/inside-repo checks, repo_has_commits, staged/unstaged/untracked detection, rename normalization, non-ASCII paths, and the combined-diff / diff-for-paths output shapes, using real git repos in tmp_path (same pattern as tests/test_run_apply.py).
• Note: copy detection is exercised as "shows up as two separate adds" rather than a C status, since get_staged_changes() calls git diff --name-status without -C, so git never actually reports copies through that path today (only renames, which are detected by default in modern git).

Test plan

• pytest -q
• ruff check . / ruff format --check .

Closes #17

(Re-opened as a new PR: the original PR #25 was auto-closed by GitHub when main's history was rewritten to correct a contributor's commit attribution — this branch is unchanged.)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e4cd46ef-7bb1-4fa0-9608-cef3e0f66eab

📥 Commits

Reviewing files that changed from the base of the PR and between 11a379a and c55ca93.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• pyproject.toml
• tests/test_git.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/git-module-coverage

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