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linalg-to-tensor-ext: reorder kernel lowering to avoid plaintext/ciphertext type issues #1409

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linalg-to-tensor-ext: reorder kernel lowering to avoid plaintext/ciphertext type issues

I don't think there's a way to avoid this - I moved final computations outside of the loop to be before the loop, so that the iter_arg of the loop can be a ciphertext type to match with the yielded ciphertext type.

Before, the iter_arg of the loop was the initial bias, a plaintext type, which meant that we had a type issue at secret-to-ckks since the iter arg of a for loop must match the yielded type (which will become a ciphertext once the partial matmul result is added to it)

Related to #1338

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