add GTCRN protocol metadata

README.md

@@ -25,6 +25,9 @@ required by MLX convolutions.
   `d503ed83a35b91f66af97a6a1b07a76425988db7d9744556d0565c336a7e6e3b`.
 - `conversion.json` - deterministic conversion record binding the source ONNX,
   audit, converter revision, weight SHA-256, byte count, and 179 tensors.
+- `metadata.json` - GTCRN Simple protocol metadata shared with the pinned ONNX
+  asset. Its SHA-256 is
+  `070f320defc15d4e1781b0c5b9225d9f91031ed5f14f675efa497f244e640615`.
 - `LICENSE` - the upstream GTCRN MIT license.
 
 ## Provenance

metadata.json

@@ -0,0 +1,53 @@
+{
+  "protocol": "gtcrn-simple-v1",
+  "model_type": "gtcrn",
+  "sample_rate": 16000,
+  "resample": {
+    "kind": "sherpa-linear-resample",
+    "lowpass_cutoff_ratio": 0.99,
+    "lowpass_filter_width": 6,
+    "flush": true
+  },
+  "stft": {
+    "n_fft": 512,
+    "hop_length": 256,
+    "window_length": 512,
+    "window_type": "hann_sqrt",
+    "bins": 257
+  },
+  "input": {
+    "name": "mix",
+    "dtype": "float32",
+    "shape": [1, 257, 1, 2],
+    "complex_layout": "real_imag"
+  },
+  "caches": [
+    {
+      "input_name": "conv_cache",
+      "output_name": "conv_cache_out",
+      "dtype": "float32",
+      "shape": [2, 1, 16, 16, 33]
+    },
+    {
+      "input_name": "tra_cache",
+      "output_name": "tra_cache_out",
+      "dtype": "float32",
+      "shape": [2, 3, 1, 1, 16]
+    },
+    {
+      "input_name": "inter_cache",
+      "output_name": "inter_cache_out",
+      "dtype": "float32",
+      "shape": [2, 1, 33, 16]
+    }
+  ],
+  "output": {
+    "name": "enh",
+    "dtype": "float32",
+    "shape": [1, 257, 1, 2],
+    "complex_layout": "real_imag"
+  },
+  "limits": {
+    "max_output_samples": 4800000
+  }
+}