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/checklists/plot-structure-checklist.md

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+# Plot Structure Checklist
+
+## Opening
+- [ ] Hook engages within first page
+- [ ] Genre/tone established early
+- [ ] World rules clear
+- [ ] Protagonist introduced memorably
+- [ ] Status quo established before disruption
+
+## Structure Fundamentals
+- [ ] Inciting incident by 10-15% mark
+- [ ] Clear story question posed
+- [ ] Stakes established and clear
+- [ ] Protagonist commits to journey
+- [ ] B-story provides thematic counterpoint
+
+## Rising Action
+- [ ] Complications escalate logically
+- [ ] Try-fail cycles build tension
+- [ ] Subplots weave with main plot
+- [ ] False victories/defeats included
+- [ ] Character growth parallels plot
+## Midpoint
+- [ ] Major reversal or revelation
+- [ ] Stakes raised significantly  
+- [ ] Protagonist approach shifts
+- [ ] Time pressure introduced/increased
+- [ ] Point of no return crossed
+
+## Crisis Building
+- [ ] Bad guys close in (internal/external)
+- [ ] Protagonist plans fail
+- [ ] Allies fall away/betray
+- [ ] All seems lost moment
+- [ ] Dark night of soul (character lowest)
+
+## Climax
+- [ ] Protagonist must act (no rescue)
+- [ ] Uses lessons learned
+- [ ] Internal/external conflicts merge
+- [ ] Highest stakes moment
+- [ ] Clear win/loss/transformation
+
+## Resolution
+- [ ] New equilibrium established
+- [ ] Loose threads tied
+- [ ] Character growth demonstrated
+- [ ] Thematic statement clear
+- [ ] Emotional satisfaction delivered