Expose common gotool targets (build, clients, version, unicast-test,
deadzone) with configurable PORT, and add goTool/.gitignore for gotool.
Co-authored-by: Cursor <cursoragent@cursor.com>
Add esp_now_messages.proto with EspNowMessage types, encode/decode helpers,
and Makefile targets to regenerate firmware and UART schemas together.
Co-authored-by: Cursor <cursoragent@cursor.com>