chore: ignore test-data directory

Add test-data/ to .gitignore to exclude test files from version control.
Clean up previous test commit comments.

Author: Mearman

.gitignore

@@ -46,5 +46,6 @@ logs/
 
 # Claude Code memory (should not be committed)
 .claude/
-CLAUDE.md# Test commit to verify GitHub Packages permissions
-# Retrigger CI after GitHub App packages permission update
+
+# Test data and temporary files
+test-data/