fix: remove version_cache.json and add to gitignore

Cache files should not be tracked in repository.

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

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

Author: unhappychoice

.gitignore

@@ -41,4 +41,4 @@ cobertura.xml
 *.profraw
 
 # Claude Code
-.claude/
+.claude/version_cache.json