feat: rename everything

lua/diffs/health.lua

@@ -0,0 +1,20 @@
+local M = {}
+
+function M.check()
+  vim.health.start('diffs.nvim')
+
+  if vim.fn.has('nvim-0.9.0') == 1 then
+    vim.health.ok('Neovim 0.9.0+ detected')
+  else
+    vim.health.error('diffs.nvim requires Neovim 0.9.0+')
+  end
+
+  local fugitive_loaded = vim.fn.exists(':Git') == 2
+  if fugitive_loaded then
+    vim.health.ok('vim-fugitive detected')
+  else
+    vim.health.warn('vim-fugitive not detected (required for unified diff highlighting)')
+  end
+end
+
+return M