Add logging to streaming path in agent-runner

src/lambdas/agent-runner/handler.py

@@ -228,6 +228,8 @@ def handler(event, context):
                         continue
                     # Extract text delta from contentBlockDelta
                     delta = event.get('event', {}).get('contentBlockDelta', {}).get('delta', {})
+                    if not isinstance(delta, dict):
+                        continue
                     token = delta.get('text', '') or event.get('data', '')
                     if token:
                         text_buffer += token
@@ -236,11 +238,14 @@ def handler(event, context):
                             or len(text_buffer) > 800
                         )
                         if flush and text_buffer.strip():
+                            print(f'[agent-runner] send chunk {len(text_buffer)}c to {chat_id}')
                             send_telegram_direct(str(chat_id), bot_token, text_buffer.strip())
                             text_buffer = ''
 
     # Flush any remaining text
+    print(f'[agent-runner] stream done buffer={len(text_buffer)} bot_token_set={bool(bot_token)}')
     if text_buffer.strip() and bot_token:
+        print(f'[agent-runner] flushing {len(text_buffer)}c to {chat_id}')
         send_telegram_direct(str(chat_id), bot_token, text_buffer.strip())
 
     print(f"[agent-runner] Completed session={session_id} actor={actor_id}")