feat(telegram): reasoning rides under the draft status while the turn runs

tests/test_telegram.py

@@ -1228,18 +1228,50 @@ def test_progress_updates_reach_the_draft_but_hidden_reasoning_does_not() -> Non
     assert draft.status == texts.writing
 
 
-def test_reasoning_from_an_agent_whose_thinking_is_not_progress_stays_hidden() -> None:
+def test_reasoning_rides_under_the_status_and_never_reaches_the_text() -> None:
     draft = _progress_draft()
     texts = TelegramTexts()
     stub = SimpleNamespace(_drafts={"k": draft}, texts=texts)
-    TelegramFrontend._feed_draft(
-        cast("Any", stub),
-        "k",
-        _thinking_delta("weighing it"),
-        thinking_is_progress=False,
+    feed = functools.partial(
+        TelegramFrontend._feed_draft, cast("Any", stub), "k", thinking_is_progress=False
     )
+
+    feed(_thinking_delta("weighing <it> "))
+    feed(_thinking_delta("against the note"))
     assert draft.text == ""
     assert draft.status == texts.thinking
+    assert draft._render() == (
+        f"{texts.thinking}\n\n"
+        "<blockquote>weighing &lt;it&gt; against the note</blockquote>",
+        f"{texts.thinking}\n\nweighing <it> against the note",
+    )
+
+    feed(
+        {
+            "event": {
+                "type": "content_block_start",
+                "index": 2,
+                "content_block": {"type": "thinking"},
+            }
+        }
+    )
+    assert draft.reasoning == ""
+    feed(_thinking_delta("word " * 200))
+    shown = draft._render()[1].removeprefix(f"{texts.thinking}\n\n")
+    assert shown.startswith("… word")
+    assert len(shown) <= 402
+
+    feed(
+        {
+            "event": {
+                "type": "content_block_delta",
+                "index": 3,
+                "delta": {"type": "text_delta", "text": "Done."},
+            }
+        }
+    )
+    assert draft.reasoning == ""
+    assert draft._render()[1] == f"{texts.writing}\n\nDone."
 
 
 def test_a_tool_call_between_progress_updates_starts_a_new_paragraph() -> None: