fix(backends,conversations,telegram,ui): a background subagent reports back as its own turn

tests/test_telegram.py

@@ -4,7 +4,7 @@ import contextlib
 import tempfile
 from pathlib import Path
 from types import SimpleNamespace
-from typing import Any
+from typing import Any, cast
 
 import pytest
 from aiogram.exceptions import TelegramBadRequest, TelegramNetworkError
@@ -16,6 +16,7 @@ from beaver_gateway.app import McpRegistry
 from beaver_gateway.backends.transcript import build_entries
 from beaver_gateway.frontends.base import GatewayRuntime
 from beaver_gateway.frontends.telegram import Attachments, TelegramFrontend
+from beaver_gateway.frontends.telegram.drafts import Draft
 from beaver_gateway.frontends.telegram.render import (
     LIMIT,
     chunks,
@@ -719,6 +720,22 @@ def test_chunks_split_blockquote_and_stay_under_limit() -> None:
     assert " ".join(parts).split() == long_line.split()
 
 
+def test_draft_breaks_a_paragraph_after_a_tool_call() -> None:
+    draft = Draft(cast("Any", None), chat_id=1, thread_id=None, turn_id="t")
+    draft.append("Checking the balance.")
+    draft.set_status("⏳ Bash")
+    draft.set_status("✍️ writing")
+    draft.append("It is 20 378.")
+    assert draft.text == "Checking the balance.\n\nIt is 20 378."
+    draft.set_status("⏳ Read")
+    draft.append("\n\nAnd a list:")
+    assert draft.text.endswith("It is 20 378.\n\nAnd a list:")
+    fresh = Draft(cast("Any", None), chat_id=1, thread_id=None, turn_id="u")
+    fresh.set_status("⏳ Bash")
+    fresh.append("First words")
+    assert fresh.text == "First words"
+
+
 def test_to_html_tail_inside_fence() -> None:
     full = (
         "intro\n```py\n" + "\n".join(f"code {i} <" for i in range(200)) + "\n```\nafter"