v0.3.2

Fix: sudo cableprobe when installed with pipx

sudo resets PATH, so a pipx / pip install --user install of cableprobe
(in ~/.local/bin) gave sudo: cableprobe: command not found. The not-root
warning now detects this and prints commands that actually work:

• sudo <absolute-path-to-cableprobe> …
• sudo env "PATH=$PATH" cableprobe …
• sudo ./scripts/install.sh for a permanent /usr/local/bin symlink (the
  recommended setup for a test rig)

When cableprobe is already on root's PATH it still prints the plain
sudo cableprobe ….

Installers pull the new probes' tools

scripts/install.sh and the pi-gen recipe now apt install iw (for
wifi_scan) and pciutils alongside usbutils / util-linux.

Docs

README gains a "command not found" troubleshooting note and flags
scripts/install.sh as the recommended rig install.

Upgrade: pipx upgrade cableprobe (or pipx install "cableprobe==0.3.2")