feat: Add organic variation to illustration batch generation

[madjin]

Summary

Closes #34

Adds a "daily creative brief" system that introduces natural variation in batch-generated illustrations while maintaining reproducibility.

Changes

• Creative Brief System: Each day gets a unique creative direction combining:

  • Interpretive lens (7 options): emotion, journey, conflict, collaboration, breakthrough, scale, individual impact
  • Compositional approach (6 options): bird's eye, close-up, wide shot, diagonal, silhouette, split frame
  • Seasonal mood (4 seasons): Atmospheric tone derived from date

• Style Rotation: Uses suggested_styles from style-presets.json instead of hardcoded CATEGORY_STYLES mapping

• Character Shuffle: Date-seeded randomization of character order and count (1, 2, or all available)

Example Output

Dec 30:

Today's creative direction:
  Lens: Focus on the INDIVIDUAL IMPACT on one person
  Composition: Silhouette against dramatic backdrop
  Mood: winter stillness, contemplative, cool tones

Dec 31:

Today's creative direction:
  Lens: Frame this as a BREAKTHROUGH or DISCOVERY moment
  Composition: Wide establishing shot showing full context
  Mood: winter stillness, contemplative, cool tones

Reproducibility

All randomness is date-seeded: same date = same output.

7 lenses × 6 compositions × 4 seasons = 168 unique creative briefs before repeating.

Test Plan

• Run --dry-run with multiple dates to verify variation
• Verify style rotation matches suggested_styles in config
• Verify character shuffle produces varied arrangements
• Verify reproducibility (same date = same output)

🤖 Generated with Claude Code

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/organic-variation

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