Verified workflow (not first-principles): host udev rules with uaccess ACL (maps by UID
into the toolbox; group access shows nobody:nobody), prebuilt probe-rs in the toolbox,
probe-rs run --chip RP235x pm-kit.elf for flash+RTT defmt streaming.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
