Add params.json (model metadata; also the Hub download-count query file)

params.json

@@ -0,0 +1,26 @@
+{
+  "framework": "nnU-Net v2.5 (custom fork: nnUNet_hti_cbdc_nnUNet_v2.5)",
+  "task": "multi-class aorta segmentation in CTA (AortaSeg24 challenge)",
+  "pipeline": "two-stage: 3d_lowres binary aorta localization -> ROI (scaling factor m=2.0) -> 3d_fullres 24-class segmentation",
+  "checkpoint_name": "checkpoint_final.pth",
+  "datasets": {
+    "Dataset825_AortaSeg24_CTA_bin_50": {
+      "stage": 1,
+      "configuration": "3d_lowres",
+      "num_classes": 2,
+      "folds": ["0", "all"],
+      "trainer": "nnUNetTrainer_CE_DC_CBDC_NoMirroring_500epochs"
+    },
+    "Dataset824_AortaSeg24_CTA_50": {
+      "stage": 2,
+      "configuration": "3d_fullres",
+      "num_classes": 24,
+      "folds": ["0", "1", "2", "3", "4", "all"],
+      "trainer": "nnUNetTrainer_Hierarchical_CBDC_AortaSeg23_NoMirroring_500epochs"
+    }
+  },
+  "layout": "mirrors nnUNet_results/ and can be downloaded directly into it",
+  "code": "https://github.com/PengchengShi1220/AortaSeg24",
+  "citation": "arXiv:2511.14187",
+  "license": "apache-2.0"
+}