feat: add Reasonix keymap <C-i> with adaptive split direction

lua/keymap.lua

@@ -36,4 +36,15 @@ G.map({
   { 'n', '<down>',     ':res +5<CR>' },
   { 'n', '<left>',     ':vertical resize -5<CR>' },
   { 'n', '<right>',    ':vertical resize +5<CR>' },
+
+  -- Reasonix AI agent：根据窗口宽高自适应方向（宽→上下分屏，高→左右分屏）
+  { 'n', '<C-i>', function()
+    local ui = vim.api.nvim_list_uis()[1]
+    local wide = ui.width > ui.height
+    local term = require('toggleterm.terminal').Terminal:new({
+      direction = wide and 'horizontal' or 'vertical',
+      cmd = 'reasonix',
+    })
+    term:toggle()
+  end, { noremap = true } },
 })