opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine

hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.

- _resolve_tui_engine() (env > config > ink); refuses opentui on
  Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
  must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
  is JSC; the V8 flag errors/ignores).

Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.

tests/gateway/test_voice_command.py

@@ -415,17 +415,14 @@ class TestSendVoiceReply:
 
     @pytest.mark.asyncio
     async def test_calls_tts_and_send_voice(self, runner):
-        from gateway.config import Platform
-
         mock_adapter = AsyncMock()
         mock_adapter.send_voice = AsyncMock()
         event = _make_event()
-        event.source.platform = Platform.TELEGRAM
         runner.adapters[event.source.platform] = mock_adapter
 
         tts_result = json.dumps({"success": True, "file_path": "/tmp/test.ogg"})
 
-        with patch("tools.tts_tool.text_to_speech_tool", return_value=tts_result) as mock_tts, \
+        with patch("tools.tts_tool.text_to_speech_tool", return_value=tts_result), \
              patch("tools.tts_tool._strip_markdown_for_tts", side_effect=lambda t: t), \
              patch("os.path.isfile", return_value=True), \
              patch("os.unlink"), \
@@ -433,32 +430,9 @@ class TestSendVoiceReply:
             await runner._send_voice_reply(event, "Hello world")
 
         mock_adapter.send_voice.assert_called_once()
-        assert mock_tts.call_args.kwargs["output_path"].endswith(".ogg")
         call_args = mock_adapter.send_voice.call_args
         assert call_args.kwargs.get("chat_id") == "123"
 
-    @pytest.mark.asyncio
-    async def test_non_telegram_auto_voice_reply_uses_mp3(self, runner):
-        from gateway.config import Platform
-
-        mock_adapter = AsyncMock()
-        mock_adapter.send_voice = AsyncMock()
-        event = _make_event()
-        event.source.platform = Platform.SLACK
-        runner.adapters[event.source.platform] = mock_adapter
-
-        tts_result = json.dumps({"success": True, "file_path": "/tmp/test.mp3"})
-
-        with patch("tools.tts_tool.text_to_speech_tool", return_value=tts_result) as mock_tts, \
-             patch("tools.tts_tool._strip_markdown_for_tts", side_effect=lambda t: t), \
-             patch("os.path.isfile", return_value=True), \
-             patch("os.unlink"), \
-             patch("os.makedirs"):
-            await runner._send_voice_reply(event, "Hello world")
-
-        mock_adapter.send_voice.assert_called_once()
-        assert mock_tts.call_args.kwargs["output_path"].endswith(".mp3")
-
     @pytest.mark.asyncio
     async def test_auto_voice_reply_uses_thread_metadata_helper(self, runner):
         from gateway.config import Platform
@@ -1955,49 +1929,6 @@ class TestVoiceTimeoutCleansRunnerState:
 
         assert 111 not in adapter._voice_clients
 
-    @pytest.mark.asyncio
-    async def test_timeout_skips_disconnect_when_voice_mode_off(self, adapter):
-        """Voice-off is deliberate text-only mode, not idle neglect — the
-        inactivity timer must NOT disconnect or spam the channel (#PanBartosz)."""
-        disconnect_calls = []
-        adapter._on_voice_disconnect = lambda chat_id: disconnect_calls.append(chat_id)
-        adapter._voice_mode_getter = lambda chat_id: "off"
-
-        mock_vc = MagicMock()
-        mock_vc.is_connected.return_value = True
-        mock_vc.disconnect = AsyncMock()
-        adapter._voice_clients[111] = mock_vc
-        adapter._voice_text_channels[111] = 999
-        adapter._voice_timeout_tasks[111] = MagicMock()
-
-        with patch("asyncio.sleep", new_callable=AsyncMock):
-            await adapter._voice_timeout_handler(111)
-
-        # Still connected, no disconnect callback, no "inactivity timeout" spam.
-        assert 111 in adapter._voice_clients
-        assert disconnect_calls == []
-        mock_vc.disconnect.assert_not_called()
-
-    @pytest.mark.asyncio
-    async def test_timeout_still_disconnects_when_voice_mode_active(self, adapter):
-        """A non-off mode still auto-disconnects on genuine inactivity."""
-        disconnect_calls = []
-        adapter._on_voice_disconnect = lambda chat_id: disconnect_calls.append(chat_id)
-        adapter._voice_mode_getter = lambda chat_id: "all"
-
-        mock_vc = MagicMock()
-        mock_vc.is_connected.return_value = True
-        mock_vc.disconnect = AsyncMock()
-        adapter._voice_clients[111] = mock_vc
-        adapter._voice_text_channels[111] = 999
-        adapter._voice_timeout_tasks[111] = MagicMock()
-
-        with patch("asyncio.sleep", new_callable=AsyncMock):
-            await adapter._voice_timeout_handler(111)
-
-        assert 111 not in adapter._voice_clients
-        assert disconnect_calls == ["999"]
-
 
 # =====================================================================
 # Bug 6: play_in_voice_channel has playback timeout