Fix Qwen session tool calls and expose thinking compatibility

tools/tht/internal/modelprojection/projection_test.go

@@ -97,6 +97,30 @@ func TestDeepSeekBuiltinAndMetadataShareCatalogIdentityAndSecretReference(t *tes
 	}
 }
 
+func TestQwenThinkingFormatSurvivesCatalogAndPiProjection(t *testing.T) {
+	i := projectionFixture(t)
+	model := i.ModelCatalog.Providers["local"].Models["qwen"]
+	if err := json.Unmarshal([]byte(`{"reasoning":true,"contextWindow":32768,"maxTokens":8192,"compatibility":{"supportsDeveloperRole":false,"supportsReasoningEffort":false,"supportsStore":false,"maxTokensField":"max_tokens","thinkingFormat":"qwen-chat-template"}}`), model.Session); err != nil {
+		t.Fatal(err)
+	}
+	files, err := Render(i)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, path := range []string{CatalogFile, PiModelsFile} {
+		if !bytes.Contains(files[path], []byte(`"thinkingFormat": "qwen-chat-template"`)) {
+			t.Fatalf("%s dropped Qwen thinking compatibility", path)
+		}
+	}
+	var models piModels
+	if err := json.Unmarshal(files[PiModelsFile], &models); err != nil {
+		t.Fatal(err)
+	}
+	if !models.Providers["local"].Models[0].Reasoning {
+		t.Fatal("Pi must know the model supports explicit thinking control")
+	}
+}
+
 func TestProjectionKeepsSingleUseInventoryOutOfSharedPiSelection(t *testing.T) {
 	i := projectionFixture(t)
 	p := i.ModelCatalog.Providers["zai"]