Remove obsolete audio and buzzer control documentation files, including detailed guides and HTML interfaces, to streamline the repository and eliminate redundancy. This cleanup enhances maintainability and focuses on essential resources for the reTerminal DM4 audio and buzzer functionalities.

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