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/is-generator-fn/index.js

@@ -0,0 +1,14 @@
+'use strict';
+const {toString} = Object.prototype;
+
+module.exports = value => {
+	if (typeof value !== 'function') {
+		return false;
+	}
+
+	return (value.constructor && value.constructor.name === 'GeneratorFunction') ||
+		toString.call(value) === '[object GeneratorFunction]';
+};
+
+// TODO: Remove this for the next major release
+module.exports.default = module.exports;