Engine: command-sequence fuzz harness (undo/redo, XLSX round-trip, full-recalc invariants) and the bugs it found

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
neilcawse
2026-10-11 16:39:31 -04:00
co-authored by Claude Opus 5.5
parent 13afa8c773
commit 828efab385
15 changed files with 1544 additions and 50 deletions
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