Editor tooling packages (heavy dependencies)

This directory intentionally keeps the heavy editor tooling in packages.nix: language servers, formatters, compilers, and other editor-adjacent tools that pull in a large closure.

Editor programs, keymaps, $EDITOR defaults, and usage docs live under ../../core/editors/ (Helix, Neovim backup, glossary, cheatsheets).

default.nix imports ./packages.nix so home/base/tui can keep pulling in tooling without mixing it into core/editors.