Raspberry Pi Pico Knight Rider LED Scanner (6 LED Back-Forth, GP9 ↔ GP14)

Classic "Knight Rider" LED scanner effect with Pico! 🚗 6 LEDs go left-to-right, then right-to-left, forever. Like the front grille of KITT car from the iconic 80s TV series. This project is an upgrade of #153 Chasing LED — same 6 LED circuit (GP9-GP14), different code pattern. Learn `reversed()` function for list reversal, two separate `for` loops for back-and-forth pattern, and generating **multiple animations on same circuit**. Same hardware (6 LEDs, 6 × 220Ω resistors), completely different v