Selkie tests: count replacements before either list; width below the guard

Review found the extended-count test passed with the second replacement
read after the first list (its first list was empty), and the below-guard
test passed without the guard. Each now fails on that mistake.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
779b827d33Dara Adedeji committed on 10/14/2026, 3:19:44 PMparent6643077

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