Consistently use ⎕← for negating shyness

**Page on which the enhancement should be made**
generic

**Describe the enhancement you would like**
Always use `⎕←` to suppress shyness.

**Additional information**
`⊢` doesn't work in dyalogscript where there's no implicit output.
`+` is doubly wrong as it risks conjugating any complex numbers in the output

Start with the generic page named in the issue and search for uses of ⊢ and + that suppress shyness. Done means those cases consistently use ⎕←, while preserving the documented concerns about dyalogscript output and complex numbers.

Written by the indexing model from the issue text.