feat: lemmas about String.Pos.nextn#13106
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TwoFX merged 2 commits intoleanprover:masterfrom Mar 24, 2026
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This PR verifies
String.Pos.nextnby providing the low-level APInextn_zero/nextn_add_oneas well as aSplitslemma.The
Splitslemma trivially implies, for a strings, the statement(s.drop n).copy.toList = s.toList.drop n, to be included in a later PR.