feat: complete code cleanup and create feature parity plan

Major Architecture Improvements:
- Separate JavaScript library (lib/) with proper build system
- Go CLI with embedded library using go:embed
- Hot reload development with Air integration
- Library + CLI build pipeline with npm run build

Code Cleanup:
- Remove obsolete assets (insertr-cli/assets/editor/)
- Clean up package.json metadata and dependencies
- Update .gitignore for new architecture
- Remove unused 'marked' dependency

New Documentation:
- Add comprehensive TODO.md with feature gap analysis
- Document critical gaps between prototype and current library
- Create phased implementation plan for feature parity
- Update DEVELOPMENT.md with hot reload workflow
- Add LIBRARY.md documenting new architecture

Hot Reload System:
- Air watches both Go CLI and JavaScript library
- Library changes trigger: rebuild → copy → CLI rebuild → serve
- Seamless development experience across full stack

Next Steps:
- Current library is basic proof-of-concept (prompt() editing)
- Archived prototype has production-ready features
- Phase 1 focuses on professional forms and authentication
- Phase 2 adds validation and content persistence

package.json

@@ -1,15 +1,15 @@
 {
   "name": "insertr",
   "version": "0.1.0",
-  "description": "Edit-in-place CMS for client websites - simple integration with class-based content editing",
-  "main": "demo-site/insertr/insertr.js",
+  "description": "The Tailwind of CMS - Zero-configuration content editing for any static site",
+  "main": "lib/dist/insertr.js",
   "scripts": {
     "dev": "node scripts/dev.js serve",
     "dev:about": "live-server demo-site --port=3000 --open=/about.html",
     "dev:check": "node scripts/dev.js check",
     "dev:demo": "node scripts/dev.js demo",
     "dev:help": "node scripts/dev.js help",
-    "build": "echo 'Build script placeholder - will bundle insertr.js for distribution'",
+    "build": "node scripts/build.js",
     "test": "echo 'Test script placeholder - will add tests for insertr.js'",
     "lint": "echo 'Linting placeholder - will add ESLint'",
     "serve": "npm run dev",
@@ -17,13 +17,13 @@
   },
   "keywords": [
     "cms",
-    "edit-in-place",
-    "inline-editing",
+    "headless-cms",
+    "static-site-generator",
     "content-management",
-    "client-websites",
+    "build-time-enhancement",
+    "zero-config",
     "go",
-    "htmx",
-    "alpine"
+    "javascript"
   ],
   "author": "Your Name",
   "license": "MIT",
@@ -42,7 +42,5 @@
     "defaults",
     "not IE 11"
   ],
-  "dependencies": {
-    "marked": "^16.2.1"
-  }
+  "dependencies": {}
 }