feat(ledstrip): breathe the accent while suspended

`udt-ledstrip sleep` plays the accent alone as the strip's breathing
scene, desaturated to 60 and at half brightness. Its DP 51 layout,
mode 0x03 with flags 0, was read off the strip's status push while the
Tuya app set a breathing scene; the selftest checks it against that
capture.

AGENTS.md also records why poweroff never reached the strip:
rc.6 stops networking before it signals Hyprland, so the
hyprland.shutdown handler fires with no route. The power menu now
switches the strip off before loginctl instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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