Add Creative Writing expansion pack (#414)

* Add Creative Writing expansion pack
- 10 specialized writing agents for fiction and narrative design
- 8 complete workflows (novel, screenplay, short story, series)
- 27 quality checklists for genre and technical validation
- 22 writing tasks covering full creative process
- 8 professional templates for structured writing
- KDP publishing integration support

* Fix bmad-creative-writing expansion pack formatting and structure

- Convert all agents to standard BMAD markdown format with embedded YAML
- Add missing core dependencies (create-doc, advanced-elicitation, execute-checklist)
- Add bmad-kb.md customized for creative writing context
- Fix agent dependency references to only include existing files
- Standardize agent command syntax and activation instructions
- Clean up agent dependencies for beta-reader, dialog-specialist, editor, genre-specialist, narrative-designer, and world-builder

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Co-authored-by: Brian <bmadcode@gmail.com>

expansion-packs/bmad-creative-writing/data/story-structures.md

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+# Story Structure Patterns
+
+## Three-Act Structure
+- **Act 1 (25%)**: Setup, inciting incident
+- **Act 2 (50%)**: Confrontation, complications
+- **Act 3 (25%)**: Resolution
+
+## Save the Cat Beats
+1. Opening Image (0-1%)
+2. Setup (1-10%)
+3. Theme Stated (5%)
+4. Catalyst (10%)
+5. Debate (10-20%)
+6. Break into Two (20%)
+7. B Story (22%)
+8. Fun and Games (20-50%)
+9. Midpoint (50%)
+10. Bad Guys Close In (50-75%)
+11. All Is Lost (75%)
+12. Dark Night of Soul (75-80%)
+13. Break into Three (80%)
+14. Finale (80-99%)
+15. Final Image (99-100%)
+## Hero's Journey
+1. Ordinary World
+2. Call to Adventure
+3. Refusal of Call
+4. Meeting Mentor
+5. Crossing Threshold
+6. Tests, Allies, Enemies
+7. Approach to Cave
+8. Ordeal
+9. Reward
+10. Road Back
+11. Resurrection
+12. Return with Elixir
+
+## Seven-Point Structure
+1. Hook
+2. Plot Turn 1
+3. Pinch Point 1
+4. Midpoint
+5. Pinch Point 2
+6. Plot Turn 2
+7. Resolution
+
+## Freytag's Pyramid
+1. Exposition
+2. Rising Action
+3. Climax
+4. Falling Action
+5. Denouement
+
+## Kishōtenketsu (Japanese)
+- **Ki**: Introduction
+- **Shō**: Development
+- **Ten**: Twist
+- **Ketsu**: Conclusion