Add ONNX graphs: KvasirSEG.onnx, KvasirSEG.onnx.config.json, KvasirSEG.onnx.provenance.json (tools/hf_onnx_export.py)

KvasirSEG.onnx

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+version https://git-lfs.github.com/spec/v1
+oid sha256:9405f4d5aeec09297f1fa12b79f8b0623089a1e47659438636a2a262d7de505d
+size 141448683

KvasirSEG.onnx.config.json

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+{
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+  "model": {
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+    "args": {
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+    "threshold": 0.5
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+}

KvasirSEG.onnx.provenance.json

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+{
+  "schema": "medotter/graph-provenance/v1",
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+    "reference": "KvasirSEG.pth",
+    "model": "CASCADE",
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+    "onnx": "1.22.0",
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+  "exported_at": "2026-09-09T22:55:49+00:00",
+  "release": {
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+    "tool": "tools/hf_onnx_export.py",
+    "stamped_at": "2026-09-09T22:56:12+00:00"
+  }
+}