New project under bootloader/ with the same structure as color_switcher: Dockerfile, docker-compose, modular CMake, and APP_BOOT + SYS_ECU stub components. Reuses common/ submodules for MCU_UART, MCU_USB, HAL_COM, STD_TYPES. TODO.md lists all open design decisions (interface, protocol, flash layout, entry trigger, integrity checks, flash strategy) and the implementation tasks that depend on them.