fix(qwen): recognize saved text derivatives

tests/test_loader_boundaries.py

@@ -573,6 +573,21 @@ def test_qwen_single_device_uses_per_device_free_memory(monkeypatch):
     assert loader._qwen_single_device(216.0, "4bit") == 1
 
 
+def test_qwen_saved_text_derivative_reuses_single_device_runtime(monkeypatch):
+    config = _config(model_type="qwen3_5_text")
+    monkeypatch.setattr(loader, "_require_qwen_hybrid_kernels", Mock())
+    monkeypatch.setattr(loader, "_estimate_model_memory_gb", Mock(return_value=54.0))
+    monkeypatch.setattr(loader, "_qwen_single_device", Mock(return_value=2))
+
+    assert loader.qwen_hybrid_runtime_overrides(
+        config,
+        torch.bfloat16,
+    ) == {
+        "attn_implementation": "sdpa",
+        "device_map": {"": 2},
+    }
+
+
 def test_model_handle_metadata_snapshot_restore_summary_and_cleanup(tmp_path):
     model = _model()
     nested = SimpleNamespace(