Implement automatic page scaling feature with viewport adjustments

chromium-setup/emmc-provisioning/cloud-init/user-data

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+#cloud-config
+# Cloud-init user-data for reTerminal DM4 golden image (eMMC).
+# Copy to the boot (FAT32) partition of your image as 'user-data'.
+# Raspberry Pi OS uses NoCloud: meta-data, user-data, network-config on boot partition.
+
+package_update: true
+package_upgrade: false
+
+packages:
+  - chromium-browser
+  - wmctrl
+  # - python3-pip   # uncomment if you need Flask/other apps
+
+# Optional: set hostname from serial or leave default
+# hostname: reterminal-%s  # %s = first column of meta-data instance-id if set
+
+# Optional: enable I2C/SPI for reTerminal peripherals (LED, buzzer, etc.)
+# Uncomment if your image does not already enable these:
+# write_files:
+#   - path: /boot/firmware/config.txt.d/99-reterminal.txt
+#     content: |
+#       dtparam=i2c_arm=on
+#       dtparam=spi=on
+
+# Run once on first boot (e.g. copy kiosk scripts, start Chromium on boot)
+runcmd:
+  # Example: ensure Chromium kiosk autostart
+  # - systemctl enable chromium-kiosk
+  - cloud-init single --name cc_final_message
+
+# Power state after first boot (optional)
+# power_state:
+#   mode: reboot
+#   delay: 1