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/tasks/analyze-story-structure.md

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+# Analyze Story Structure
+
+## Purpose
+Perform comprehensive structural analysis of a narrative work to identify strengths, weaknesses, and improvement opportunities.
+
+## Process
+
+### 1. Identify Structure Type
+- Three-act structure
+- Five-act structure  
+- Hero's Journey
+- Save the Cat beats
+- Freytag's Pyramid
+- Kishōtenketsu
+- In medias res
+- Non-linear/experimental
+
+### 2. Map Key Points
+- **Opening**: Hook, world establishment, character introduction
+- **Inciting Incident**: What disrupts the status quo?
+- **Plot Point 1**: What locks in the conflict?
+- **Midpoint**: What reversal/revelation occurs?
+- **Plot Point 2**: What raises stakes to maximum?
+- **Climax**: How does central conflict resolve?
+- **Resolution**: What new equilibrium emerges?
+### 3. Analyze Pacing
+- Scene length distribution
+- Tension escalation curve
+- Breather moment placement
+- Action/reflection balance
+- Chapter break effectiveness
+
+### 4. Evaluate Setup/Payoff
+- Track all setups (promises to reader)
+- Verify each has satisfying payoff
+- Identify orphaned setups
+- Find unsupported payoffs
+- Check Chekhov's guns
+
+### 5. Assess Subplot Integration
+- List all subplots
+- Track intersection with main plot
+- Evaluate resolution satisfaction
+- Check thematic reinforcement
+
+### 6. Generate Report
+Create structural report including:
+- Structure diagram
+- Pacing chart
+- Problem areas
+- Suggested fixes
+- Alternative structures
+
+## Output
+Comprehensive structural analysis with actionable recommendations