fix: tighten mtm-ddwipe usage and device checks

Add an explicit mounted-device check with findmnt, shorten confirmation prompts, and align the usage text and log wording with the current script name.

.continue/rules/project.md

@@ -14,7 +14,7 @@ description: mtm-ddwipe project conventions
 - Keep user-facing messages short and clear.
 - Keep error and help messages short and clear.
 - Prefer minimal, focused changes that preserve intent.
-- Keep `.continue/rules/project.md` aligned with project conventions and concise.
+- Keep `.continue/rules/project.md` aligned and concise.
 - `mtm-ddwipe` is a small Bash script with helper functions.
 - Keep the host and line-number removal behavior intact for related output processing.
 - `mtm-ddwipe` must print a usage line and support `-h`/`--help`.

mtm-ddwipe

@@ -8,7 +8,7 @@ STARTDATESTRING=""
 
 usage() {
 	cat <<EOF
-Usage: mtm-ddwipe-2 DEVICE
+Usage: mtm-ddwipe DEVICE
 
 Wipe a block device.
 
@@ -58,8 +58,12 @@ check_device() {
 check_device_not_in_use() {
 	local dev="$1"
 
+	if findmnt -rn --target "$dev" >/dev/null 2>&1; then
+		die "Device is mounted: $dev"
+	fi
+
 	if lsblk -nrpo NAME,MOUNTPOINT "$dev" | awk '$2 != "" { found=1 } END { exit !found }'; then
-		die "Device or one of its children is mounted: $dev"
+		die "Device or child is mounted: $dev"
 	fi
 }
 
@@ -67,13 +71,11 @@ confirm_wipe() {
 	local dev="$1"
 	local choice=""
 
-	echo "Selected device:"
+	echo "Device:"
 	lsblk -o NAME,SIZE,TYPE,FSTYPE,MOUNTPOINT,MODEL,SERIAL "$dev"
 	echo ""
-	echo "This will destroy data on: $dev"
 	echo "Type exactly: WIPE $dev"
-	echo ""
-	read -r -p "Confirmation: " choice
+	read -r -p "Confirm: " choice
 	[ "$choice" = "WIPE $dev" ] || die "Canceled"
 	echo ""
 }
@@ -143,7 +145,7 @@ wipe_dev() {
 	STARTDATE=$(date +%s)
 	STARTDATESTRING="$(date)"
 
-	log "Begin wiping device $dev"
+	log "Begin wiping: $dev"
 	echo ""
 	log "Start date :"
 	log "$STARTDATESTRING"