feat(markdown): thinking blocks between hidden tool calls collapse to the first one

src/beaver_gateway/frontends/markdown/renderer.py

@@ -48,14 +48,19 @@ def render_assistant_text(text: str) -> str:
 def render_assistant_message(message: Message) -> str:
     """Render an assistant ``Message`` into a turn block.
 
-    Tool-use blocks render to nothing; only text and thinking content reach
-    the file (see :mod:`.parser` for how the reverse strip works).
+    Tool-use blocks render to nothing; of the thinking blocks between two
+    texts only the first one reaches the file.
     """
     parts: list[str] = ["### Assistant:", ""]
+    after_thinking = False
     for block in message.content:
+        thinking = isinstance(block, ThinkingBlock)
+        if thinking and after_thinking:
+            continue
         lines = list(_render_block(block))
         if not lines:
             continue
+        after_thinking = thinking
         parts.extend(lines)
         parts.append("")
     return "\n".join(parts).rstrip() + "\n"