I think the Lisps, and especially Common Lisp, in addition to Smalltalk gives you a lot of the things you mention here. That interactive development environment where you can compile any code at any time is almost a given in these, with example programs such as GNU Emacs and Nyxt, that can be reprogrammed on the fly in release mode too. It is pretty interesting to look at and play with, if you fire up something like Emacs + Slime/Sly and SBCL for Common Lisp or the bundled IDE for a Smalltalk such as Squeak or Pharo.