exec-cycle.sh's live preview now shows brightness/exposure and lets
+/-, ./, adjust them per-frame via fswebcam --set, with r to reset;
webcam.conf centralizes the starting values, step size, capture
resolution/quality, and the v4l2 control names (which vary by camera)
so hardware-specific tuning doesn't require editing the scripts.
txt2printr.sh writes directly to /dev/lp0, which needs the lp kernel
driver loaded (via parport/parport_pc) and lp group membership for
non-root write access; wire both up during dependency install.
writes raw bytes to /dev/lp0 (overridable via PRINTER_DEV): resets the
printer with ESC @, converts LF to CRLF to avoid staircasing on raw
device writes, then form-feeds to eject the page.
replaced the guvcview+keypress capture flow with a continuous
capture/convert/display loop so the terminal shows a live ascii
preview; pressing c saves the frame and triggers the new
txt2printr.sh hook (currently a blank template).
Amir Alexander Abdelbaki