Deckbuilder MCP Server

# Speaker Notes Feature - Implementation Plan ## Current State Analysis - **No existing speaker notes functionality** in the codebase - Python-pptx >=1.0.0 provides robust notes slide API - Current architecture: `engine.py` → `presentation_builder.py` → `slide_builder.py` ## Implementation Plan ### Phase 1: Core Infrastructure 1. **Extend canonical JSON format** to support `speaker_notes` field 2. **Enhance SlideBuilder** (`slide_builder.py`) to process speaker notes after main content 3. **Add notes processing method** using python-pptx `slide.notes_slide` API ### Phase 2: Content Integration 4. **Leverage existing ContentFormatter** for rich text formatting in notes 5. **Support markdown frontmatter** notes syntax in structured frontmatter 6. **Ensure inline formatting** (bold, italic, underline) works in notes ### Phase 3: MCP Tools Enhancement 7. **Update MCP tools** to accept and process speaker notes in markdown 8. **Enhance validation** to include notes slide validation 9. **Add comprehensive testing** for notes functionality ### Technical Approach - Use python-pptx `slide.notes_slide` and `notes_text_frame` APIs - Create notes slides on-demand when content provided - Maintain backward compatibility with existing presentations - Follow existing architecture patterns for consistency This will add professional speaker notes support while preserving Deckbuilder's content-first philosophy and robust template system.