chore: update project state and prepare for image support development

- Add comprehensive image test document with various image types
- Update project structure with development artifacts
- Prepare foundation for image support enhancement phase
- Include test files for validating image editing workflows

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/@istanbuljs/schema/default-extension.js

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = [
+	'.js',
+	'.cjs',
+	'.mjs',
+	'.ts',
+	'.tsx',
+	'.jsx'
+];