chore: revert gitignore additions for test artifacts

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

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

Author: Ambient Code Bot

.gitignore

@@ -136,5 +136,3 @@ hack/
 
 # Personal exports
 *.csv
-credentials-testing.md
-components/ambient-cli/credential.yaml