• grading: anchor level-23 git regexes — appended commands no longer graded correct
• grading: #require is whitespace-insensitive (bc <<< '3 + 4' passes)
• vi: counted find-motion operators (Ndf/Ncf/Nyf) keep their count, no keystroke swallow
• stats: corrupt tier no longer counted as mastered
• scores: higher tier wins a same-second concurrent tie
• profile: out-of-range fields clamped before migration re-save
• sandbox: reap only transient snap staging, never live checkpoints