scripts: use $0 for error/usage name in s/job

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/s/job

@@ -19,13 +19,14 @@ set -euo pipefail
 
 MOUNT=${OLLIE:-$HOME/mnt/ollie}
 
-die() { printf 'oq: %s\n' "$*" >&2; exit 1; }
+cmd=${0##*/}
+die() { printf '%s: %s\n' "$cmd" "$*" >&2; exit 1; }
 trap 'printf "\n"' EXIT
 
 usage() {
-    cat <<'EOF'
-usage: oq [flags] [prompt...]
-       echo "prompt" | oq [flags]
+    cat <<EOF
+usage: $cmd [flags] [prompt...]
+       echo "prompt" | $cmd [flags]
 
 Flags:
   -name NAME        base job name; jobs suffixed -0, -1, ...