fix: skip IDNA encoding for IP hosts in URL.to_uri#196
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IPv6 literals contain colons and are already ASCII. Passing them through idna_encode raised InvalidCodepoint for hosts like ::1. Skip IDNA when parse_host reports an IP family.
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URL.to_uri hits InvalidCodepoint when IPv6 host ::1. This PR fixes the regression with a focused test covering the case. RED-GREEN proved; awaiting thermo