pub static VGA_DEBUG_BUFFER: AtomicBoolExpand description
When true (default), log lines are also written into the lock-free
circular buffer (vgabuf) for async display by the status line task.
Disable this when using VGA_DEBUG_LIVE to avoid duplicate output and
visual clutter. Re-enable when live debug is turned off so the status
line task keeps the framebuffer terminal up to date.