feat(bokeh): implement ridgeline-basic

[claude]

Summary

Implements ridgeline-basic for bokeh.

Parent Issue: #539
Base Branch: plot/ridgeline-basic

Files

• plots/ridgeline-basic/implementations/bokeh.py

Preview

Preview will be uploaded to GCS staging after this workflow completes.

[github-actions]

⏭️ Plot Tests Skipped

No plot files changed

Compatibility:

Note: Only Python 3.13 is required to pass. Python 3.12 is tested for compatibility.

[claude]

AI Review - Attempt 1/3

Quality Evaluation

Evaluator	Score	Verdict
Claude	92/100	approve

Criteria Checklist

• VQ-001: X-axis labeled "Temperature (°C)", Y-axis uses month tick labels
• VQ-002: Grid is subtle (x-grid only, alpha 0.5)
• VQ-003: Elements clear - distributions well-sized, alpha 0.7
• VQ-004: No overlap - all month labels readable, no text collision
• VQ-005: Legend N/A - single series with intuitive color gradient
• VQ-006: Colorblind safe - blue/yellow/red gradient without problematic combinations
• VQ-007: Image size 4800×2700 px ✓
• VQ-008: Title "Monthly Temperature Distributions" present
• CQ-005: Constants well-documented (overlap=0.7, alpha=0.7, etc.)
• CR-001: Data accurately represents monthly temperature distributions
• CR-002: Spec compliance - KDE smoothing, 10-30% overlap, alpha 0.6-0.8, gradient coloring

Strengths

1. Excellent visual design: Color gradient from cool (winter) to warm (summer) and back creates intuitive seasonal representation
2. Proper ridgeline overlap: 0.7 overlap factor creates the classic Joy Division aesthetic
3. Clean KDE implementation: scipy.gaussian_kde with proper normalization
4. White edge lines: Nice separation between distributions
5. Correct layering: Bottom-to-top rendering ensures proper z-order

Minor Observations (no score deduction)

• Y-axis label is empty (y_axis_label=""), but month names as tick labels serve the purpose well
• HTML output also generated for interactivity (bonus feature)

Issues Found

None - implementation meets all requirements.

AI Feedback for Next Attempt

N/A - No improvements needed.

Verdict: APPROVED