fix(tui): restore resumed transcript lineage

tests/test_tui_gateway_server.py

@@ -59,6 +59,69 @@ def test_write_json_returns_false_on_broken_pipe(monkeypatch):
     assert server.write_json({"ok": True}) is False
 
 
+def test_history_to_messages_preserves_tool_calls_for_resume_display():
+    history = [
+        {"role": "user", "content": "first prompt"},
+        {
+            "role": "assistant",
+            "content": "",
+            "tool_calls": [
+                {
+                    "id": "call_1",
+                    "function": {
+                        "name": "search_files",
+                        "arguments": json.dumps({"pattern": "resume"}),
+                    },
+                }
+            ],
+        },
+        {"role": "tool", "content": "{}", "tool_call_id": "call_1"},
+        {"role": "assistant", "content": "first answer"},
+        {"role": "user", "content": "second prompt"},
+    ]
+
+    assert server._history_to_messages(history) == [
+        {"role": "user", "text": "first prompt"},
+        {"context": "resume", "name": "search_files", "role": "tool"},
+        {"role": "assistant", "text": "first answer"},
+        {"role": "user", "text": "second prompt"},
+    ]
+
+
+def test_session_resume_uses_parent_lineage_for_display(monkeypatch):
+    captured = {}
+
+    class FakeDB:
+        def get_session(self, target):
+            return {"id": target}
+
+        def reopen_session(self, target):
+            captured["reopened"] = target
+
+        def get_messages_as_conversation(self, target, include_ancestors=False):
+            captured.setdefault("history_calls", []).append((target, include_ancestors))
+            return [
+                {"role": "user", "content": "root prompt"},
+                {"role": "assistant", "content": "root answer"},
+            ] if include_ancestors else [{"role": "user", "content": "tip prompt"}]
+
+    monkeypatch.setattr(server, "_get_db", lambda: FakeDB())
+    monkeypatch.setattr(server, "_enable_gateway_prompts", lambda: None)
+    monkeypatch.setattr(server, "_set_session_context", lambda target: [])
+    monkeypatch.setattr(server, "_clear_session_context", lambda tokens: None)
+    monkeypatch.setattr(server, "_make_agent", lambda *args, **kwargs: types.SimpleNamespace(model="test"))
+    monkeypatch.setattr(server, "_session_info", lambda agent: {"model": "test", "tools": {}, "skills": {}})
+    monkeypatch.setattr(server, "_init_session", lambda sid, key, agent, history, cols=80: None)
+
+    resp = server.handle_request({"id": "1", "method": "session.resume", "params": {"session_id": "tip"}})
+
+    assert resp["result"]["messages"] == [
+        {"role": "user", "text": "root prompt"},
+        {"role": "assistant", "text": "root answer"},
+    ]
+    assert captured["history_calls"] == [("tip", False), ("tip", True)]
+
+
 def test_status_callback_emits_kind_and_text():
     with patch("tui_gateway.server._emit") as emit:
         cb = server._agent_cbs("sid")["status_callback"]