chore(build): drop unused JMAP variable

jmap.py is an authoring-only tool and is not invoked at build time; remove the
dead variable so the script matches the README.

Signed-off-by: LÁZÁR Imre <imre@illusion.hu>
Assisted-by: claude-code@claude-opus-4-8

build-baseline.sh

@@ -13,7 +13,6 @@
 set -euo pipefail
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 OUT="${1:-$ROOT/out}"
-JMAP="$ROOT/lib/jmap.py"
 log(){ printf '[build] %s\n' "$*"; }
 
 rm -rf "$OUT"; mkdir -p "$OUT"