Remove mid-stream flush on newlines: prevents split multi-turn responses

src/lambdas/agent-runner/handler.py

@@ -245,11 +245,8 @@ def handler(event, context):
                     token = delta.get('text', '')
                     if token:
                         text_buffer += token
-                        flush = (
-                            text_buffer.rstrip().endswith(('\n\n', '.\n', '!\n', '?\n'))
-                            or len(text_buffer) > 800
-                        )
-                        if flush and text_buffer.strip():
+                        # Only flush if buffer is very large — prevents splitting multi-turn responses
+                        if len(text_buffer) > 1200:
                             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 = ''