feat(editor): implement embedded template system (TASK-009)

- Add ProjectTemplate TypeScript interfaces for type-safe templates
- Implement EmbeddedTemplateProvider for bundled templates
- Create Hello World template (Router + Home page + Text)
- Update LocalProjectsModel to use embedded templates by default
- Remove programmatic project creation workaround
- Fix: Add required fields (id, comments, metadata) per TASK-010
- Fix: Correct node type 'PageRouter' → 'Router'
- Add comprehensive developer documentation

Benefits:
- No more path resolution issues (__dirname/process.cwd())
- Works identically in dev and production
- Type-safe template definitions
- Easy to add new templates

Closes TASK-009 (Phase 3 - Editor UX Overhaul)

dev-docs/tasks/phase-3-editor-ux-overhaul/TASK-009-template-system-refactoring/README.md

@@ -1,9 +1,9 @@
 # TASK-009: Template System Refactoring
 
-**Status**: 📋 Planned  
+**Status**: 🟢 Complete (Backend)  
 **Priority**: Medium  
 **Complexity**: Medium  
-**Estimated Effort**: 2-3 days
+**Actual Effort**: 1 day (Backend implementation)
 
 ## Context
 
@@ -244,12 +244,100 @@ class TemplateManager {
 - Failed attempt: `packages/noodl-editor/src/editor/src/utils/forge/template/providers/local-template-provider.ts`
 - Template registry: `packages/noodl-editor/src/editor/src/utils/forge/index.ts`
 
+## Implementation Summary (January 9, 2026)
+
+### ✅ What Was Completed
+
+**Phase 1-3: Backend Implementation (Complete)**
+
+1. **Type System Created**
+
+   - `ProjectTemplate.ts` - Complete TypeScript interfaces for templates
+   - Comprehensive type definitions for components, nodes, connections, and settings
+
+2. **EmbeddedTemplateProvider Implemented**
+
+   - Provider that handles `embedded://` protocol
+   - Templates stored as TypeScript objects, bundled by webpack
+   - No file I/O dependencies, works identically in dev and production
+
+3. **Hello World Template Created**
+
+   - Structure: App → PageRouter → Page "/Home" → Text "Hello World!"
+   - Clean and minimal, demonstrates Page Router usage
+   - Located in `models/template/templates/hello-world.template.ts`
+
+4. **Template Registry Integration**
+
+   - `EmbeddedTemplateProvider` registered with highest priority
+   - Backward compatible with existing HTTP/Noodl Docs providers
+
+5. **LocalProjectsModel Updated**
+
+   - Removed programmatic project creation workaround
+   - Default template now uses `embedded://hello-world`
+   - Maintains backward compatibility with external templates
+
+6. **Documentation**
+   - Complete developer guide in `models/template/README.md`
+   - Instructions for creating custom templates
+   - Architecture overview and best practices
+
+### 📁 Files Created
+
+```
+packages/noodl-editor/src/editor/src/models/template/
+├── ProjectTemplate.ts                    # Type definitions
+├── EmbeddedTemplateProvider.ts          # Provider implementation
+├── README.md                            # Developer documentation
+└── templates/
+    └── hello-world.template.ts          # Default template
+```
+
+### 📝 Files Modified
+
+- `utils/forge/index.ts` - Registered EmbeddedTemplateProvider
+- `utils/LocalProjectsModel.ts` - Updated newProject() to use embedded templates
+
+### 🎯 Benefits Achieved
+
+✅ No more `__dirname` or `process.cwd()` path resolution issues  
+✅ Templates work identically in development and production builds  
+✅ Type-safe template definitions with full IDE support  
+✅ Easy to add new templates - just create a TypeScript file  
+✅ Maintains backward compatibility with external template URLs
+
+### ⏳ Remaining Work (Future Tasks)
+
+- **UI for Template Selection**: Gallery/dialog to choose templates when creating projects
+- **Additional Templates**: Blank, Dashboard, E-commerce templates
+- **Template Export**: Allow users to save their projects as templates
+- **Unit Tests**: Test suite for EmbeddedTemplateProvider
+- **Template Validation**: Verify template structure before project creation
+
+### 🚀 Usage
+
+```typescript
+// Create project with embedded template (automatic default)
+LocalProjectsModel.instance.newProject(callback, {
+  name: 'My Project'
+  // Uses 'embedded://hello-world' by default
+});
+
+// Create project with specific template
+LocalProjectsModel.instance.newProject(callback, {
+  name: 'My Project',
+  projectTemplate: 'embedded://hello-world'
+});
+```
+
 ## Related Tasks
 
-- None yet (this is the first comprehensive template system task)
+- **TASK-009-UI**: Template selection gallery (future)
+- **TASK-009-EXPORT**: Template export functionality (future)
 
 ---
 
 **Created**: January 8, 2026  
-**Last Updated**: January 8, 2026  
-**Assignee**: TBD
+**Last Updated**: January 9, 2026  
+**Implementation**: January 9, 2026 (Backend complete)