fix(openapi): restore embedded request wrappers (#4176)

FastAPI generator now only unwraps body params explicitly marked with
Body(embed=False) so the /eval run_eval schema once again exposes
RunEvalRequest, matching our integration tests and the server's request
parsing.

Regenerated the OpenAPI specs to capture the restored wrapper.

CI on the Stainless preview builds should be green.

docs/static/experimental-llama-stack-spec.yaml

@@ -300,7 +300,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/BenchmarkConfig'
+              $ref: '#/components/schemas/RunEvalRequest'
         required: true
   /v1alpha/eval/benchmarks/{benchmark_id}/jobs/{job_id}:
     get:
@@ -6711,6 +6711,14 @@ components:
       - scores
       title: EvaluateResponse
       description: The response from an evaluation.
+    RunEvalRequest:
+      properties:
+        benchmark_config:
+          $ref: '#/components/schemas/BenchmarkConfig'
+      type: object
+      required:
+      - benchmark_config
+      title: RunEvalRequest
     Job:
       properties:
         job_id: