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/deepmerge/rollup.config.js

@@ -0,0 +1,22 @@
+import resolve from 'rollup-plugin-node-resolve'
+import commonjs from 'rollup-plugin-commonjs'
+import pkg from './package.json'
+
+export default {
+	input: `index.js`,
+	plugins: [
+		commonjs(),
+		resolve(),
+	],
+	output: [
+		{
+			file: pkg.main,
+			format: `cjs`
+		},
+		{
+			name: 'deepmerge',
+			file: 'dist/umd.js',
+			format: `umd`
+		},
+	],
+}