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improvise/crates
Edward Langley 4f75fffcb9 improvise-h6z1: one fold memo per grid build, keyed by fold key and span
viewport::grid_body makes one FoldMemo and passes it to every cell and
total through GridLayout::evaluate_in / column_total, so a fold row's
formula chain is evaluated once across the row (9, not 45). The bench
gains a folded five-formula chain case; stored-only grids are unchanged.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze
2026-09-23 09:09:34 -07:00
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