[Misc] remove legacy full_duplex alias for auto_response (#8024)

Signed-off-by: Nick Cao <ncao@redhat.com>
Co-authored-by: Codex <noreply@openai.com>

vllm_omni/engine/duplex/session/emitter.py

@@ -125,7 +125,7 @@ class SessionEmitter:
         extra = getattr(self._ctx.session.config, "extra_body", None)
         if not isinstance(extra, dict):
             return False
-        return extra.get("auto_response") is True or extra.get("full_duplex") is True
+        return extra.get("auto_response") is True
 
     def is_stale_model_output(self, payload: dict[str, object]) -> bool:
         """Whether ``payload`` belongs to a turn the session has already moved past."""

vllm_omni/model_executor/models/nemotron_voicechat/duplex/serving_adapter.py

@@ -117,9 +117,7 @@ def _render_tool_response(output: str) -> str:
 
 def _require_native_full_duplex(config: object) -> None:
     extra_body = getattr(config, "extra_body", None)
-    enabled = isinstance(extra_body, dict) and (
-        extra_body.get("auto_response") is True or extra_body.get("full_duplex") is True
-    )
+    enabled = isinstance(extra_body, dict) and extra_body.get("auto_response") is True
     if not enabled:
         raise ServingRuntimeConfigError(
             "Nemotron VoiceChat currently supports model-native full-duplex streaming only; "

vllm_omni/model_executor/models/qwen3_omni/duplex/plugin.py

@@ -160,7 +160,7 @@ class Qwen3OmniDuplexPlugin(DuplexModelPlugin):
     def validate_client_extra_body(self, extra_body):
         if not isinstance(extra_body, Mapping):
             return
-        if extra_body.get("auto_response") or extra_body.get("full_duplex"):
+        if extra_body.get("auto_response"):
             raise DuplexRuntimeConfigError(
                 "Qwen requires server VAD or explicit commits; native auto_response is unsupported"
             )