Align cyd_35r with CYD_PROJECT_GUIDE (ST7796/GT911), export flashable firmware/cyd_35r. Co-authored-by: Cursor <cursoragent@cursor.com>
Point README/AGENTS at the shared CYD_PROJECT_GUIDE (LVGL, flashable firmware, local git). Co-authored-by: Cursor <cursoragent@cursor.com>