Add standalone Neovim Lua config

Replace the neovim stow package's symlink into vim/.vim with a real,
independent Lua config: init.lua + lua/config/* (options, keymaps,
autocmds, lazy.nvim bootstrap) + lua/plugins/*.lua (one file per plugin
group).

- Plugin manager: lazy.nvim (self-bootstrapping, no submodule needed).
- Carries over every plugin from the vimrc as-is: vim-airline (+ themes,
  tmuxline), vim-janah colorscheme, nerdtree, vim-signify, nerdcommenter,
  ale, vim-fugitive, quick-scope, ctrlp.vim, claude-code.nvim, plus
  vim-ansible-yaml/vim-terraform gated the same way the vimrc gated them
  (executable() checks, now as lazy.nvim `cond` functions).
- Replaces YouCompleteMe + jedi-vim entirely with nvim-lspconfig +
  mason.nvim + mason-lspconfig.nvim (ensure_installed: pyright, lua_ls,
  bashls, terraformls, yamlls, ts_ls, cssls, html; clangd enabled
  directly since it's already on PATH via Xcode CLT) and blink.cmp for
  completion (+ friendly-snippets), with blink's LSP capabilities merged
  into every server's default config.
- ALE stays as a pure linter/fixer (g:ale_disable_lsp = 1) so it doesn't
  duplicate nvim-lspconfig's diagnostics/hover/go-to-definition.
- Ports the vimrc's general settings/functions (options, window-nav
  keymaps, arrow-key disabling, StripTrailingWhitespace, AppendModeline,
  the git->Git abbreviation) to Lua; drops the w!! sudo-save abbreviation
  (vimrc's own comment notes it doesn't work under Neovim) and the
  reload-vimrc-on-save autocmd (no clean Lua equivalent).

Vim's own vimrc, ftplugin/python.vim, and plugin installs are completely
untouched and unaffected by this change.

4 files changed, 112 insertions, 0 deletions

diff --git a/neovim/.config/nvim/lua/config/autocmds.lua b/neovim/.config/nvim/lua/config/autocmds.lua
new file mode 100644
index 0000000..7bc4f6b
--- /dev/null
+++ b/neovim/.config/nvim/lua/config/autocmds.lua
@@ -0,0 +1,22 @@
+-- Remove trailing spaces on save, preserving cursor and search pattern
+local function strip_trailing_whitespace()
+  if vim.list_contains({ "markdown", "diff" }, vim.bo.filetype) then
+    return
+  end
+  local view = vim.fn.winsaveview()
+  vim.cmd([[keeppatterns %s/\s\+$//e]])
+  vim.fn.winrestview(view)
+end
+
+vim.api.nvim_create_autocmd("BufWritePre", {
+  pattern = "*",
+  callback = strip_trailing_whitespace,
+})
+
+-- Note: the colorscheme (with its "desert" fallback) is applied from
+-- lua/plugins/colorscheme.lua's own `config` function, not here — under
+-- lazy.nvim that's the natural place to react to "the plugin is now loaded".
+--
+-- Note: the vimrc's "reload vimrc on save" autocmd has no clean Lua
+-- equivalent (module caching means `require()`-based configs aren't simply
+-- re-sourceable) and is deliberately not ported.
diff --git a/neovim/.config/nvim/lua/config/keymaps.lua b/neovim/.config/nvim/lua/config/keymaps.lua
new file mode 100644
index 0000000..f0bfbec
--- /dev/null
+++ b/neovim/.config/nvim/lua/config/keymaps.lua
@@ -0,0 +1,37 @@
+local map = vim.keymap.set
+
+-- Switch windows with <C-[direction]>
+map("n", "<C-j>", "<C-w>j")
+map("n", "<C-k>", "<C-w>k")
+map("n", "<C-h>", "<C-w>h")
+map("n", "<C-l>", "<C-w>l")
+
+-- Never use the arrow keys
+for _, key in ipairs({ "<Up>", "<Down>", "<Left>", "<Right>" }) do
+  map({ "n", "i" }, key, "<Nop>")
+end
+
+-- Disable ex mode
+map("n", "Q", "<Nop>")
+
+-- Expand :git to fugitive's :Git, but only as a whole command.
+-- (No Lua-native abbreviation API exists, so this stays a thin vim.cmd call.)
+vim.cmd([[cnoreabbrev <expr> git (getcmdtype() ==# ':' && getcmdline() ==# 'git') ? 'Git' : 'git']])
+
+-- Note: the vimrc's `w!!` sudo-save abbreviation is deliberately NOT ported
+-- here — its own comment says it doesn't work under Neovim (sudo can't
+-- prompt for a password there).
+
+-- Append modeline when pressing <leader>ml
+local function append_modeline()
+  local modeline = string.format(
+    " vim: set ts=%d sw=%d tw=%d %set :",
+    vim.bo.tabstop,
+    vim.bo.shiftwidth,
+    vim.bo.textwidth,
+    vim.bo.expandtab and "" or "no"
+  )
+  modeline = vim.bo.commentstring:gsub("%%s", modeline)
+  vim.api.nvim_buf_set_lines(0, -1, -1, false, { modeline })
+end
+map("n", "<leader>ml", append_modeline, { silent = true })
diff --git a/neovim/.config/nvim/lua/config/lazy.lua b/neovim/.config/nvim/lua/config/lazy.lua
new file mode 100644
index 0000000..5a645c1
--- /dev/null
+++ b/neovim/.config/nvim/lua/config/lazy.lua
@@ -0,0 +1,17 @@
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not vim.uv.fs_stat(lazypath) then
+  vim.fn.system({
+    "git",
+    "clone",
+    "--filter=blob:none",
+    "https://github.com/folke/lazy.nvim.git",
+    "--branch=stable",
+    lazypath,
+  })
+end
+vim.opt.rtp:prepend(lazypath)
+
+require("lazy").setup("plugins", {
+  install = { colorscheme = { "janah", "desert" } },
+  checker = { enabled = false },
+})
diff --git a/neovim/.config/nvim/lua/config/options.lua b/neovim/.config/nvim/lua/config/options.lua
new file mode 100644
index 0000000..be614e1
--- /dev/null
+++ b/neovim/.config/nvim/lua/config/options.lua
@@ -0,0 +1,36 @@
+-- Ported from vim/.vim/vimrc's "DEFAULT VIM SETTINGS" block. `syntax on` and
+-- `filetype plugin indent on` are intentionally omitted: both are Neovim
+-- defaults (see `:help nvim-defaults`).
+
+local opt = vim.opt
+
+opt.number = true
+opt.relativenumber = true
+opt.list = true
+opt.modeline = true
+opt.background = "dark"
+opt.foldmethod = "indent"
+opt.listchars = { trail = "·", tab = "▸ ", eol = "¬" }
+opt.scrolloff = 1
+opt.backspace = { "indent", "eol", "start" }
+opt.cursorline = true
+opt.hidden = true -- already Neovim's default; set explicitly for parity with the vimrc
+opt.wildmenu = true -- already Neovim's default; set explicitly for parity with the vimrc
+
+-- Faster gutter updates (signify) and snappier <Esc>
+opt.updatetime = 100
+opt.ttimeoutlen = 10
+
+-- Persistent undo across sessions
+local undodir = vim.fn.stdpath("data") .. "/undo"
+if vim.fn.isdirectory(undodir) == 0 then
+  vim.fn.mkdir(undodir, "p", "0700")
+end
+opt.undofile = true
+opt.undodir = undodir
+
+-- Search-related things
+opt.hlsearch = true
+opt.incsearch = true
+opt.ignorecase = true
+opt.smartcase = true