045892bc94a3f9063d9ed08eeb128f50a1632e32
USB passthrough (1ea1aa4) made /dev/usb/lp1 visible in the container, but the node
is `crw-rw---- root:lp` (660) and the server runs as the non-root `app` user, not in
`lp` — so open(O_WRONLY) → EACCES → printer still "offline". Add the host's `lp` GID
(7 on this Ubuntu booth, verified `getent group lp` → lp:x:7:) via group_add, so the
app process gains the supplementary group that owns the node. Least-privilege: no
world-writable device, no root, no image rebuild. (If a future booth's lp GID differs,
update the number.)
Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V
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