feat: support Podcast generation

src/podcast/graph/audio_mixer_node.py

@@ -0,0 +1,13 @@
+import logging
+
+from src.podcast.graph.state import PodcastState
+
+logger = logging.getLogger(__name__)
+
+
+def audio_mixer_node(state: PodcastState):
+    logger.info("Mixing audio chunks for podcast...")
+    audio_chunks = state["audio_chunks"]
+    combined_audio = b"".join(audio_chunks)
+    logger.info("The podcast audio is now ready.")
+    return {"output": combined_audio}