Add ONNX export with parity report

onnx/parity_report.json

@@ -0,0 +1,20 @@
+{
+  "model": "axiotic/ogma-micro",
+  "onnx_path": "onnx/model.onnx",
+  "opset": 17,
+  "inputs": {
+    "token_ids": "int64[batch, sequence]",
+    "attention_mask": "int64[batch, sequence]",
+    "task_token_ids": "int64[batch] (4=QRY, 5=DOC, 6=SYM)"
+  },
+  "output": "embeddings float32[batch, d_output] L2-normalized",
+  "parity": {
+    "atol": 0.0001,
+    "rtol": 0.0001,
+    "max_abs_error": 3.3527612686157227e-07,
+    "mean_abs_error": 6.890632420208931e-08,
+    "mean_cosine": 1.0,
+    "passed": true
+  },
+  "file_size_bytes": 9600530
+}