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

insertr-cli/scripts/rebuild-library.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Rebuild library and copy to CLI assets
+# Used by Air for hot reloading when library changes
+
+set -e
+
+echo "🔄 Library changed, rebuilding..."
+
+# Build the library
+cd ../lib
+npm run build --silent
+
+# Copy to CLI assets
+echo "📁 Copying updated library to CLI assets..."
+cp dist/* ../insertr-cli/pkg/content/assets/
+
+# Get library version for confirmation
+VERSION=$(node -e "console.log(require('./package.json').version)")
+echo "✅ Library v$VERSION ready for CLI embedding"