Update .gitignore to exclude all SSH credential JSON files

Changed .ssh/credentials.json to .ssh/*.json to prevent any JSON
credential files from being accidentally committed.

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: jeremymanning

.gitignore

@@ -32,7 +32,7 @@ data/classifier_results/*.pkl
 .test_credentials
 
 # SSH credentials (security)
-.ssh/credentials.json
+.ssh/*.json
 
 # Model files
 models/*/model.safetensors