chore: update OpenAPI spec [sdk-bot]

Author: OpenRouter SDK Bot

.speakeasy/in.openapi.yaml

@@ -2131,6 +2131,16 @@ components:
       example:
         prefix_mismatch_behavior: 'drop_block'
       properties:
+        mismatch_behavior:
+          deprecated: true
+          description: 'Deprecated: legacy alias of prefix_mismatch_behavior. Send only one of the two.'
+          enum:
+            - 'error'
+            - 'drop_block'
+            - null
+          type:
+            - 'string'
+            - 'null'
         prefix_mismatch_behavior:
           enum:
             - 'error'