feat: add Wokwi CLI for visual breadboard simulation

- Install wokwi-cli binary from GitHub releases
- Generate wokwi.toml and board-specific diagram.json in arduino-new
  with a button + LED breadboard layout for each supported board
- Add <leader>aw keybinding in nvim to run Wokwi simulation
- Diagram templates for: uno, mega, nano, esp32, esp32s3 (+ default)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/neovim.sh

@@ -243,6 +243,7 @@ map("n", "<leader>av", "<cmd>ArduinoVerify<cr>", { desc = "Arduino Verify (compi
 map("n", "<leader>au", "<cmd>ArduinoUpload<cr>", { desc = "Arduino Upload" })
 map("n", "<leader>as", "<cmd>ArduinoSerial<cr>", { desc = "Arduino Serial Monitor" })
 map("n", "<leader>ai", "<cmd>ArduinoInfo<cr>", { desc = "Arduino Board Info" })
+map("n", "<leader>aw", "<cmd>!wokwi-cli .<cr>", { desc = "Arduino Wokwi Simulate" })
 
 -- Debug (DAP)
 map("n", "<leader>ds", function() require("dap").continue() end, { desc = "Debug Start/Continue" })