trigger CI (#6500)

## Summary
- Dummy PR with a trivial change to CONTRIBUTING.md for testing
purposes.

## Test plan
- [ ] N/A — no functional changes.

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Co-authored-by: theosanderson-agent <theo@theo.io>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

CONTRIBUTING.md

@@ -24,3 +24,4 @@ This means that the code that we develop needs to be suitably general and config
 
 The backend offers a Swagger UI and an OpenAPI specification.
 Try to keep the OpenAPI specification as correct and as useful as possible.
+