ConstNamed grep rather than find on Unix semantics: find searches by name and attributes,
grep searches contents by pattern. Selection by attribute is the regions read.
No sdk: line, deliberately. ICellRange.find cannot reproduce grep — it takes
ICell.Content fields (a different vocabulary), defaults to formulas only, and bypasses the
shared encoder — so the line would graduate an agent into a macro that returns different
answers. It returns when an SDK search with grep's contract lands.
The
grepcapability, as both surfaces see it.