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/exit-x/test/fixtures/create-files.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+rm 10*.txt
+for n in 10 100 1000; do
+  node log.js 0 $n stdout stderr &> $n-stdout-stderr.txt
+  node log.js 0 $n stdout &> $n-stdout.txt
+  node log.js 0 $n stderr &> $n-stderr.txt
+done