refactor: restore root-level development workflow with enhanced tooling

- Add root package.json with development scripts and dependencies
- Move scripts/ from lib back to root for intuitive developer experience
- Clean lib/package.json to contain only runtime dependencies
- Add comprehensive justfile with cross-platform command shortcuts
- Update README.md with new development workflow instructions
- Maintain lib as clean, publishable package while enabling root-level commands

README.md

@@ -63,28 +63,55 @@ Containers with `class="insertr"` automatically make their viable children edita
 
 ## 🛠️ Quick Start
 
-### **Development Setup**
+### **Using Just (Recommended)**
+```bash
+# Clone and setup
+git clone <repository-url>
+cd insertr
+
+# Install dependencies and start development
+just dev-setup
+
+# Or step by step:
+just install       # Install all dependencies
+just build-lib     # Build the JavaScript library
+just dev           # Start development server
+```
+
+### **Using NPM directly**
 ```bash
 # Clone repository
 git clone <repository-url>
 cd insertr
 
+# Install dependencies
+npm run install:all
+
 # Start development server with live reload
-cd insertr-cli
-air
+npm run dev
 ```
 
 Visit **http://localhost:3000** to see enhanced demo site with live reload.
 
+### **Available Commands**
+```bash
+just --list        # Show all available commands
+just dev           # Start development server
+just build         # Build library + CLI  
+just air           # Start Air hot-reload for CLI
+just check         # Validate project setup
+just clean         # Clean build artifacts
+```
+
 ### **Parse Existing Site**
 ```bash
-cd insertr-cli
-
 # Analyze HTML for editable elements
-go run main.go parse ../demo-site/
+just parse
+# or: cd insertr-cli && go run main.go parse ../demo-site/
 
 # Development server with parsing
-go run main.go servedev -i ../demo-site -p 3000
+just servedev
+# or: cd insertr-cli && go run main.go servedev -i ../demo-site -p 3000
 ```
 
 ## 📊 Parser Output Example
@@ -180,10 +207,13 @@ Static Site Build → Insertr CLI Enhancement → Enhanced Deployment
 
 ### **Live Development with Hot Reload**
 ```bash
-cd insertr-cli
-
 # 🔥 Hot Reload: watches BOTH library AND CLI
-air
+just air
+# or: cd insertr-cli && air
+
+# Alternative: Watch library only
+just watch
+# or: cd lib && npm run dev
 
 # Library changes: lib/src/**/*.js → Auto rebuild library + CLI
 # CLI changes: cmd/**/*.go → Auto rebuild CLI