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feat(daily-challenges): add 2026-09-25 valid sudoku (row/column/box counting) - #100
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…ounting) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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daily-challenges/2026/09/2026-09-25.md(Easy) — Valid Sudoku: one sweep with a set per row, column and 3×3 box, the box-index formula, and the two classic wrong answers (row/column-only checks missing box duplicates; "each row must contain 1–9" which rejects valid unfinished boards).Validation: the solution was run in Python against an empty board, a single filled cell, a row duplicate, a column duplicate, the box-only duplicate
(0,0)/(1,2)(the input that exposes the row/column-only bug), and the canonical partially-filled valid board — all results match the file's claims. Index row added todaily-challenges/README.md.