cli/history: print a row's reasoning before its answer

A reasoning trace was appended after the body it produced, which read as if the
answer had come first and the thinking had followed it. It now leads the row,
under its own `reasoning:` label with a blank line before the answer - the order
the live stream uses. The trace only prints where it already did: a turn's ends
(the default view) and -vv; previews stay silent.

src/plyngent/cli/transcript.py

@@ -243,23 +243,36 @@ def echo_row(row: Row, *, detail: Detail) -> None:
     click.echo()
 
 
+def _echo_reasoning(message: AssistantChatMessage) -> None:
+    """Print the model's reasoning trace for *message*, when it has one."""
+    shown = message.reasoning_content
+    if not isinstance(shown, str) or not shown.strip():
+        return
+    click.secho("reasoning:", fg="bright_black")
+    click.echo(shown)
+    click.echo()
+
+
 def _echo_assistant(row: Row, *, reasoning: bool) -> None:
+    """Print an assistant row: the thinking first, then the answer it produced.
+
+    A transcript reads in the order the model produced it, and the live stream
+    prints the reasoning before the answer; printing it after the body made the
+    answer look like it had come before the thinking behind it.
+    """
     from plyngent.cli.display import markdown_render_available, print_markdown
 
     message = row.message
     assert isinstance(message, AssistantChatMessage)
     click.echo(row.prefix())
+    if reasoning:
+        _echo_reasoning(message)
     content = message.content
     if isinstance(content, str) and content.strip():
         if markdown_render_available():
             print_markdown(content, label="")
         else:
             click.echo(content)
-    if reasoning:
-        shown = message.reasoning_content
-        if isinstance(shown, str) and shown.strip():
-            click.secho("reasoning:", fg="bright_black")
-            click.echo(shown)
     names = _tool_call_names(message)
     if names:
         click.secho(f"  tool_calls=[{', '.join(names)}]", fg="yellow")