New `nixvim` flake input (release branch, follows nixpkgs) drives the whole
editor from `modules/nvim.nix`, wired into `homeModules.default`. Minimal LSP
baseline (`nixd`, `bashls`) exposed as `local.nvim.lspServers`; blink-cmp,
Telescope, neo-tree, lualine, treesitter, colorizer, gitsigns, toggleterm, and a
catppuccin theme. which-key groups plus `<leader>?`/`<leader>sk` give an
in-editor keybind cheatsheet; per-directory session persistence with
`sessionoptions` + a `PersistenceSavePre` neo-tree close for clean layouts.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
