Runtime: remove redundant (and harmful?) destroy

[josephjclark]

This fixes an issue in WCS which comes out of ensure-payload-size

Readable Stream is in flowing mode, data may have been lost. Trying to pause stream.

Claude suggests the problem is the destroy() call after the stream has finished processing. It took a bit of coerscion but I think it's the one before the throw that really does it - I think the throw is interrupting the destroy. Claude suggests the iterator loop in for/await will do any tidy up we need.

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