The first revision guarded the kfd line with SUBSYSTEM=="misc", which never
matches (misc-class devices carry no subsystem for udev matching), so the rule
was read but never fired and /dev/kfd stayed 0660 root:render. Name-only match
applies 0666 on creation and on trigger.
Also fixes test-changed.sh to exit 0 when changed paths map to zero tests
(udev rules are mapped-but-untestable) instead of invoking bats with an empty
selection.
The comfyui container is spawned by a systemd user unit whose spawn context
carries no supplementary groups, so render-group access to /dev/kfd and
renderD128 was structurally unreachable (keep-groups preserved an empty set;
named group_add 'render' fails name lookup inside the userns). World-mode on
the compute nodes is the only spawn-context-independent grant; display cards
keep their modes. Apply: install to /etc/udev/rules.d, udevadm control
--reload-rules, then trigger by subsystem to re-apply modes to live nodes.
Also maps dankclaw/udev/* in the focused-test selector (not bats-testable).
Frank