1. Where Vibe Coding Breaks


Last year I was adding one more BLE sensor node to a Zephyr-based nRF52 firmware. I threw a one-liner at Claude Code — "enable the SPI driver" — and a single clean line landed in prj.conf: CONFIG_SPI_NRFX_SPIM3=y. The build passed. The binary flashed. The board would not boot. Thirty minutes of digging later, it hit...