Return BufferTooSmall for undersized poll buffers#150
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Avoid panicking when poll_output receives a buffer smaller than pending application data or queued packets. Return Output::BufferTooSmall with the required size and retain the pending output so callers can resize and retry. Document the new output variant, add a changelog entry, and cover DTLS 1.2, DTLS 1.3, and auto-sense undersized-buffer cases.
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Summary
Closes #148