fix: log exception when output guardrail raises instead of silently ignoring (#3411)

Author: cty-ut

src/agents/realtime/session.py

@@ -987,8 +987,14 @@ async def _run_output_guardrails(self, text: str, response_id: str) -> bool:
                 )
                 if result.output.tripwire_triggered:
                     triggered_results.append(result)
-            except Exception:
-                # Continue with other guardrails if one fails
+            except Exception as exc:
+                logger.warning(
+                    "Output guardrail %r raised %s: %s; skipping it.",
+                    guardrail.get_name(),
+                    type(exc).__name__,
+                    exc,
+                )
+                logger.debug("Output guardrail failure details.", exc_info=True)
                 continue
 
         if triggered_results: