nvim-treesitter-context

Sure thing! https://github.com/nvim-treesitter/nvim-treesitter-context is what I use nowadays. It has a little clip demonstrating how it works so you'll instantly know if you want it or not ;)

There are a couple of plugins that do this. For vim: https://github.com/wellle/context.vim For neovim (much higher performance in my experience): https://github.com/nvim-treesitter/nvim-treesitter-context I believe there's now also a VS code plugin for the same behavior, but I don't know what it's called.

I think you can get most of the first three of your requirements from TreeSitter and LSP. The treesitter context plugin (https://github.com/nvim-treesitter/nvim-treesitter-context) provides the package/class/function info at the top and the LSP gives you features like 'find-references' and 'go-to-definition' you can bind to the keys of your choice. I use 'gr' for 'find-references' and 'gd' for 'go-to-definition. I don't use a debug shell (I use a tmux pane and a repl usually) but I'm certain there are options.