chore: update OpenAPI spec from monorepo (#874)

Co-authored-by: OpenRouter SDK Bot <sdk-bot@openrouter.ai>

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -8395,6 +8395,7 @@ components:
         criteria:
           items:
             type: 'string'
+          minItems: 1
           type: 'array'
         instructions:
           type: 'string'