feat: implement zero-configuration auto-enhancement demo workflow

- Add intelligent auto-enhancement that detects viable content elements
- Replace manual enhancement with automated container-first detection
- Support inline formatting (strong, em, span, links) within editable content
- Streamline demo workflow: just demo shows options, auto-enhances on demand
- Clean up legacy commands and simplify directory structure
- Auto-enhancement goes directly from source to demo-ready (no intermediate dirs)
- Add Dan Eden portfolio and simple test sites for real-world validation
- Auto-enhanced 40 elements in Dan Eden portfolio, 5 in simple site
- Achieve true zero-configuration CMS experience

test-sites/simple/dan-eden-portfolio-demo/README.md

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+# Dan Eden Portfolio
+
+## Original URL
+https://daneden.me
+
+## Downloaded
+2025-09-11T15:48:33.014Z
+
+## Site Characteristics
+- **Framework**: Next.js with CSS Modules
+- **Styling**: Clean, minimal design with CSS-in-JS
+- **Content**: Personal portfolio with bio, projects, and talks
+- **Complexity**: Simple - good for basic insertr testing
+
+## Insertr Enhancement Status
+- [x] Content sections identified
+- [x] Insertr classes added to key elements
+- [x] Enhanced version created
+- [x] Insertr functionality tested
+- [x] Results documented
+
+## Test Results
+✅ **Enhancement Success**: 7 elements successfully enhanced with insertr
+✅ **Server Integration**: Site registered as "dan-eden-test" in insertr.yaml
+✅ **Content ID Generation**: Auto-generated IDs like "index-span-4ba35c" 
+✅ **Content Type Detection**: All elements correctly identified as "markdown" type
+✅ **Asset Preservation**: All original Next.js assets and styling preserved
+
+## Enhanced Elements
+1. **Main bio paragraph** (`<p class="home_xxl__iX0Z1 insertr">`) - Product designer introduction
+2. **Company name** (`<span class="insertr">Meta Reality Labs</span>`) - Current employer
+3. **App descriptions** - Ora and Solstice project descriptions
+4. **Talk content** - "Where We Can Go" title and description
+5. **Action buttons** - "Learn more" and "Read the post" links
+
+## Testing Notes
+- Clean HTML structure ideal for insertr compatibility
+- CSS Modules shouldn't interfere with insertr classes
+- Good test case for semantic content editing
+- Minimal JavaScript complexity
+
+## Files
+- `index.html.original` - Original downloaded version
+- `index.html` - Enhanced version with insertr classes
+- `insertr-config.json` - Configuration for testing
+- `_next/` - Next.js assets and styles