fix: add missing stop_over_saturated field to BenchmarkGenerativeTextArgs

The field was referenced in __main__.py but missing from the schema definition,
causing ValueError when trying to get default values.

Signed-off-by: Alon Kellner <[email protected]>

Author: AlonKellner-RedHat

src/guidellm/benchmark/schemas/generative/entrypoints.py

@@ -283,6 +283,10 @@ def get_default(cls: type[BenchmarkGenerativeTextArgs], field: str) -> Any:
     max_global_error_rate: float | None = Field(
         default=None, description="Maximum global error rate (0-1) before stopping"
     )
+    stop_over_saturated: bool = Field(
+        default=False,
+        description="Whether to stop the benchmark if over-saturation is detected",
+    )
 
     @field_validator("data", "data_args", "rate", mode="wrap")
     @classmethod