APS5_PAD_INPUT_FILE commands can set bit 0x200000 or 0x400000 to put a
finger on the left or right half of the touchpad, as the TouchLeft and
TouchRight keys do, so scripted runs can press touchpad combinations.
tools/pad_input.py queues them as touch-left and touch-right.
AI-assisted: yes
Add an optional input helper for test runs without desktop input injection. Preserve physical input and release injected buttons automatically.
Validation: guest_pad tests and Python helper CLI smoke checks passed. Written with AI assistance.