Update model.onnx with 1024-dim output (includes Asym layer)

Re-exported ONNX model with the Asym projection layer included.
This export now produces 1024-dimensional embeddings (matching the original SentenceTransformer output) instead of 768-dim.
The previous export was missing the asymmetric projection layer that transforms 768→1024 dimensions.

onnx/model.onnx

@@ -1,3 +1,3 @@
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