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description: Analyze code quality and suggest improvements
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Perform a comprehensive code quality analysis:

1. **Code Quality Issues**
   - Find unused variables and imports
   - Identify overly long functions (>50 lines)
   - Detect duplicated code

2. **Best Practices**
   - Check error handling
   - Verify naming conventions
   - Look for magic numbers

3. **Security**
   - Check for hardcoded credentials
   - Identify potential SQL injection points
   - Look for XSS vulnerabilities

4. **Summary**
   - Provide specific file:line references
   - Suggest concrete improvements
   - Prioritize by severity

Present findings in a clear, actionable format.