chore: update OpenAPI spec from monorepo

.speakeasy/in.openapi.yaml

@@ -28542,6 +28542,17 @@ components:
           description: 'A unique identifier for grouping related requests (e.g., a conversation or agent workflow). When provided, OpenRouter uses it as the sticky routing key, routing all requests in the session to the same provider to maximize prompt cache hits. Also used for observability grouping. If provided in both the request body and the x-session-id header, the body value takes precedence. Maximum of 256 characters.'
           maxLength: 256
           type: 'string'
+        stop:
+          anyOf:
+            - type: 'string'
+            - items:
+                type: 'string'
+              maxItems: 4
+              type: 'array'
+            - type: 'null'
+          description: 'Stop sequences (up to 4)'
+          example:
+            - "\n"
         stop_server_tools_when:
           $ref: '#/components/schemas/StopServerToolsWhen'
         store:
@@ -44533,6 +44544,16 @@ paths:
               schema:
                 $ref: '#/components/schemas/UnauthorizedResponse'
           description: 'Unauthorized - Authentication required or invalid credentials'
+        '404':
+          content:
+            application/json:
+              example:
+                error:
+                  code: 404
+                  message: 'Resource not found'
+              schema:
+                $ref: '#/components/schemas/NotFoundResponse'
+          description: 'Not Found - Resource does not exist'
         '429':
           content:
             application/json: