Raspberry Pi Zero 2 W image builder; Power off/Restart buttons

pi/build-image.sh makes a ready-to-flash card: Raspberry Pi OS Lite 2026-10-06
+ the Gyre software as a service on http://gyre.local (port 80), first-boot
setup through cloud-init (user, SSH key, Wi-Fi, packages from the card), USB
host mode on the Zero 2's data port. No root: mtools for the boot partition,
debugfs for the root filesystem. Wi-Fi and credentials stay in the work dir.

Web page: Power off / Restart links when GYRE_POWER_BUTTONS=1 (set by the Pi
service); thumbnails keyed by file contents so pre-made ones ship on the card;
stale thumbnails pruned.

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

pi/overlay/etc/sudoers.d/gyre-power

@@ -0,0 +1,2 @@
+# The Gyre page's Power off / Restart buttons
+gyre ALL=(root) NOPASSWD: /usr/bin/systemctl poweroff, /usr/bin/systemctl reboot