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/scripts/install-pishrink-on-host.sh

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+#!/usr/bin/env bash
+# Run on the provisioning HOST (root) to install PiShrink and dependencies.
+# Enables shrinking backups in flash-emmc-on-connect.sh when SHRINK_BACKUP=1.
+# PiShrink: https://github.com/Drewsif/PiShrink
+#
+# Offline install (when host has no internet):
+#   1. On a machine with internet: curl -Lo pishrink.sh https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
+#   2. scp pishrink.sh root@HOST:/tmp/
+#   3. On host: bash install-pishrink-on-host.sh /tmp/pishrink.sh
+#
+# Optional: PISHRINK_URL=... or pass path to local pishrink.sh as first argument.
+
+set -e
+PISHRINK_URL="${PISHRINK_URL:-https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh}"
+LOCAL_PISHRINK="$1"
+
+echo "Installing PiShrink dependencies (parted, e2fsprogs, xz-utils, ...)..."
+if apt-get update 2>/dev/null && apt-get install -y wget parted gzip pigz xz-utils udev e2fsprogs 2>/dev/null; then
+    echo "Dependencies installed."
+else
+    echo "Warning: apt install failed (e.g. host has no internet). Skipping packages."
+    echo "PiShrink needs: parted, e2fsprogs; optional: gzip/pigz, xz-utils. Install them manually if missing."
+    for cmd in parted resize2fs; do
+        if ! command -v "$cmd" &>/dev/null; then
+            echo "  Missing: $cmd — install with apt when the host has network, or use a local mirror."
+        fi
+    done
+fi
+
+if [[ -n "$LOCAL_PISHRINK" && -f "$LOCAL_PISHRINK" ]]; then
+    echo "Using local PiShrink script: $LOCAL_PISHRINK"
+    cp "$LOCAL_PISHRINK" /usr/local/bin/pishrink.sh
+    chmod +x /usr/local/bin/pishrink.sh
+    echo "PiShrink installed at /usr/local/bin/pishrink.sh"
+elif command -v wget &>/dev/null && wget -q -O /usr/local/bin/pishrink.sh "$PISHRINK_URL" 2>/dev/null; then
+    chmod +x /usr/local/bin/pishrink.sh
+    echo "PiShrink installed at /usr/local/bin/pishrink.sh"
+else
+    echo "Could not download PiShrink (no wget or no network)."
+    echo ""
+    echo "Offline install:"
+    echo "  1. On a machine WITH internet run:"
+    echo "     curl -Lo pishrink.sh $PISHRINK_URL"
+    echo "  2. Copy to host:"
+    echo "     scp pishrink.sh root@YOUR_HOST:/tmp/"
+    echo "  3. On the host run:"
+    echo "     bash install-pishrink-on-host.sh /tmp/pishrink.sh"
+    exit 1
+fi
+
+echo ""
+echo "To shrink backups automatically, add to /opt/cm4-provisioning/env:"
+echo "  SHRINK_BACKUP=1"
+echo "  # optional: PISHRINK_COMPRESS=gz   or   PISHRINK_COMPRESS=xz"