Holoscan Sensor Bridge demo bring-up

Use this skill when the user wants to bring up the Holoscan Sensor Bridge demo environment end to end.

This workflow has side effects. Never run it automatically. Only run it when the user explicitly invokes it.

Before you start — required gates (do these first, in order)

Gate 1 — Read environment variables. Before doing anything else, check these variables and print their resolved values to the user:

SSH_TARGET      Remote devkit login (e.g. nvidia@192.168.1.50). Ask the user if not set.
REMOTE_ROOT     Remote working directory (e.g. /home/nvidia). Ask the user if not set.
REMOTE_SUDO     sudo / sudo -n / "" — default to "sudo" if not set.
REMOTE_SSH_OPTS Additional SSH options (optional).
HSB_PLATFORM    Platform hint — may be empty; will detect from hardware.
HSB_REPO        Custom repo URL — defaults to https://github.com/nvidia-holoscan/holoscan-sensor-bridge.git