add BidiGeminiLiveModel and BidiOpenAIRealtimeModel to the init

src/strands/experimental/bidi/models/__init__.py

@@ -1,10 +1,38 @@
 """Bidirectional model interfaces and implementations."""
 
+from typing import TYPE_CHECKING
+
 from .model import BidiModel, BidiModelTimeoutError
 from .nova_sonic import BidiNovaSonicModel
 
+# Type checking imports for static analysis
+if TYPE_CHECKING:
+    from .gemini_live import BidiGeminiLiveModel
+    from .openai_realtime import BidiOpenAIRealtimeModel
+
 __all__ = [
     "BidiModel",
     "BidiModelTimeoutError",
     "BidiNovaSonicModel",
+    "BidiGeminiLiveModel",
+    "BidiOpenAIRealtimeModel",
 ]
+
+
+def __getattr__(name: str):
+    """
+    Lazy load bidi model implementations only when accessed.
+    
+    This defers the import of optional dependencies until actually needed:
+    - BidiGeminiLiveModel requires google-generativeai (lazy loaded)
+    - BidiOpenAIRealtimeModel requires openai (lazy loaded)
+    """
+    if name == "BidiGeminiLiveModel":
+        from .gemini_live import BidiGeminiLiveModel
+
+        return BidiGeminiLiveModel
+    if name == "BidiOpenAIRealtimeModel":
+        from .openai_realtime import BidiOpenAIRealtimeModel
+
+        return BidiOpenAIRealtimeModel
+    raise AttributeError(f"module '{__name__}' has no attribute '{name}'")