feat: add auto-reload configuration for neovim buffers

Enable automatic buffer reloading when files change on disk by:
- Setting autoread option
- Adding autocmd to check for changes on FocusGained and BufEnter events
- Adding notification when files are reloaded

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

dotfiles/nvim/lua/custom/init.lua

@@ -4,3 +4,22 @@ vim.g.copilot_no_tab_map = true
 vim.api.nvim_set_keymap("i", "<C-o>", 'copilot#Accept("<CR>")', { silent = true, expr = true, noremap = true, script = true })
 vim.wo.relativenumber = true
 vim.g.scrolloff = 8
+
+-- Auto-reload files when changed externally
+vim.opt.autoread = true
+
+-- Check for file changes when Neovim regains focus
+vim.api.nvim_create_autocmd({ "FocusGained", "BufEnter" }, {
+  pattern = "*",
+  callback = function()
+    vim.cmd("checktime")
+  end,
+})
+
+-- Notify when file has been changed externally
+vim.api.nvim_create_autocmd("FileChangedShellPost", {
+  pattern = "*",
+  callback = function()
+    vim.notify("File changed on disk. Buffer reloaded.", vim.log.levels.WARN)
+  end,
+})