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

---------

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

expansion-packs/bmad-creative-writing/workflows/novel-greenfield-workflow.yaml

@@ -0,0 +1,58 @@
+---
+workflow:
+  id: novel-greenfield-workflow
+  name: Greenfield Novel Workflow
+  description: >-
+    End‑to‑end pipeline for writing a brand‑new novel: concept → outline → draft →
+    beta feedback → polish → professional critique.
+  phases:
+    ideation:
+      - agent: narrative-designer
+        task: brainstorm-premise
+        output: concept-brief.md
+      - agent: world-builder
+        task: build-world
+        input: concept-brief.md
+        output: world-guide.md
+      - agent: character-psychologist
+        task: develop-character
+        input: concept-brief.md
+        output: characters.md
+    outlining:
+      - agent: plot-architect
+        task: analyze-story-structure
+        input:
+          - concept-brief.md
+          - world-guide.md
+          - characters.md
+        output: story-outline.md
+    drafting:
+      - agent: editor
+        task: create-draft-section
+        input: story-outline.md
+        repeat: per-chapter
+        output: draft-manuscript.md
+      - agent: dialog-specialist
+        task: workshop-dialog
+        input: draft-manuscript.md
+        output: dialog-pass.md
+    revision:
+      - agent: beta-reader
+        task: provide-feedback
+        input: draft-manuscript.md
+        output: beta-notes.md
+      - agent: editor
+        task: incorporate-feedback
+        input:
+          - draft-manuscript.md
+          - beta-notes.md
+        output: polished-manuscript.md
+    critique:
+      - agent: book-critic
+        task: critical-review
+        input: polished-manuscript.md
+        output: critic-review.md
+  completion_criteria:
+    - critic-review.md exists
+...
+