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/lines-and-columns/README.md

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+# lines-and-columns
+
+Maps lines and columns to character offsets and back. This is useful for parsers
+and other text processors that deal in character ranges but process text with
+meaningful lines and columns.
+
+## Install
+
+```
+$ npm install [--save] lines-and-columns
+```
+
+## Usage
+
+```js
+import { LinesAndColumns } from 'lines-and-columns'
+
+const lines = new LinesAndColumns(
+  `table {
+  border: 0
+}`
+)
+
+lines.locationForIndex(9)
+// { line: 1, column: 1 }
+
+lines.indexForLocation({ line: 1, column: 2 })
+// 10
+```
+
+## License
+
+MIT