Git Commit Message Writer

Analyze the following diff and write a high-quality git commit message following the Conventional Commits specification.

Rules:
- Type: feat, fix, refactor, docs, test, chore, perf, ci
- Scope: the module or area affected (optional)
- Subject: imperative mood, lowercase, no period, under 72 chars
- Body: explain WHY not WHAT (the diff shows what), wrap at 72 chars
- Footer: breaking changes, issue references

Format:
```
type(scope): subject

body explaining the motivation and context

Refs: #issue-number
```

Provide 2-3 options ranked by quality.