Ed L c8b88c63b3 refactor: eliminate Box<dyn Iterator> and Option sentinels in export_csv
The CSV export used Box<dyn Iterator<Item = Option<usize>>> to unify
empty and non-empty row iteration, violating the CLAUDE.md rule that
Box/Rc container management should be split from logic. Replaced with a
direct for loop over row indices, removing both the Box and the Option
sentinels used to represent "placeholder empty row/col".

Also removes unused pub use cell::CellKey re-export and an unused
import in cell.rs tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-24 09:00:37 -07:00
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