Overview

Complete the RAII migration of vm_builtin_arith.cpp left unfinished by SERVER-114263 (first pass). 24 functions remain on the old auto [_, tag, val] = getFromStack(N) pattern.

Scope of Work

• src/mongo/db/exec/sbe/vm/vm_builtin_arith.cpp — unary/trig functions (abs, ceil, floor, exp, ln, sqrt, all trig variants): convert to viewFromStack; round/pow/sum functions (pow, genericRoundTrunc, round, trunc, builtinDoubleDoubleSum): convert with ownership review

Technical Notes

Use SERVER-114263 and genericDiv in vm_arith.cpp as reference. viewFromStack(N) returns TagValueView — use .tag / .value (no parens). For functions passing the owned flag downstream use moveFromStack.