chore: commit pending repo changes

iso/overlay/usr/local/bin/bee-install

@@ -12,17 +12,55 @@
 
 set -euo pipefail
 
+usage() {
+    cat >&2 <<'EOF'
+Usage: bee-install <device> [logfile]
+
+  Installs the live system to a local disk (WIPES the target).
+
+  device   Target block device, e.g. /dev/sda or /dev/nvme0n1
+           Must be a hard disk or NVMe — NOT a CD-ROM (/dev/sr*)
+  logfile  Optional path for progress log (default: /tmp/bee-install.log)
+
+Examples:
+  bee-install /dev/sda
+  bee-install /dev/nvme0n1
+  bee-install /dev/sdb /tmp/my-install.log
+
+WARNING: ALL DATA ON <device> WILL BE ERASED.
+
+Layout (UEFI):  GPT — partition 1: EFI 512MB vfat, partition 2: root ext4
+Layout (BIOS):  MBR — partition 1: root ext4
+EOF
+    exit 1
+}
+
 DEVICE="${1:-}"
 LOGFILE="${2:-/tmp/bee-install.log}"
 
-if [ -z "$DEVICE" ]; then
-    echo "Usage: bee-install <device> [logfile]" >&2
-    exit 1
+if [ -z "$DEVICE" ] || [ "$DEVICE" = "--help" ] || [ "$DEVICE" = "-h" ]; then
+    usage
 fi
 if [ ! -b "$DEVICE" ]; then
     echo "ERROR: $DEVICE is not a block device" >&2
+    echo "Run 'lsblk' to list available disks." >&2
     exit 1
 fi
+# Block CD-ROM devices
+case "$DEVICE" in
+    /dev/sr*|/dev/scd*)
+        echo "ERROR: $DEVICE is a CD-ROM/optical device — cannot install to it." >&2
+        echo "Run 'lsblk' to find the target disk (e.g. /dev/sda, /dev/nvme0n1)." >&2
+        exit 1
+        ;;
+esac
+# Check required tools
+for tool in parted mkfs.vfat mkfs.ext4 unsquashfs grub-install update-grub; do
+    if ! command -v "$tool" >/dev/null 2>&1; then
+        echo "ERROR: required tool not found: $tool" >&2
+        exit 1
+    fi
+done
 
 SQUASHFS="/run/live/medium/live/filesystem.squashfs"
 if [ ! -f "$SQUASHFS" ]; then