feat: implement scatter-basic-007

[claude]

Summary

• Created specification and implementations for scatter-basic-007 (Financial Categories Bar Chart)
• Both matplotlib and seaborn implementations pass self-review with scores >95

What's Included

1. Specification: specs/scatter-basic-007.md

   • Defines requirements for financial categories bar chart
   • Includes all quality criteria and use cases

2. Matplotlib Implementation: plots/matplotlib/bar/scatter-basic-007/default.py

   • Full spec compliance
   • Self-review score: 95/100
   • Features: currency formatting, value labels, positive/negative colors

3. Seaborn Implementation: plots/seaborn/barplot/scatter-basic-007/default.py

   • Full spec compliance
   • Self-review score: 96/100
   • Fixed deprecation warnings with proper hue parameter usage

Key Features

• ✅ Support for both vertical and horizontal orientation
• ✅ Currency formatting with smart scaling (K, M for thousands/millions)
• ✅ Distinguishes positive/negative values with different colors
• ✅ Value labels on bars with proper positioning
• ✅ Professional financial chart styling
• ✅ Comprehensive input validation and error messages
• ✅ Complete docstrings and type hints

Self-Review Results

Both implementations successfully passed self-review based on quality criteria:

• Visual quality criteria: All met (axes labeled, grid subtle, no overlaps)
• Code quality criteria: All met (type hints, docstrings, validation)
• Correctness criteria: All met (accurate data, spec compliance)

Testing

Both implementations have been tested with sample financial data including:

• Multiple expense categories
• Both positive and negative values
• Proper currency formatting
• Label rotation for readability

Closes #17

🤖 Generated with Claude Code