fix: rename .build -> _build to avoid OF addon source grep exclusion

scripts/build.sh

@@ -15,7 +15,7 @@ set -e
 REPO_URL="${1:-}"
 REPO_DIR="${2:-$(pwd)/mapper}"
 OF_VERSION="0.12.1"
-OF_DIR="$REPO_DIR/.build/openFrameworks"
+OF_DIR="$REPO_DIR/_build/openFrameworks"
 OF_FILE="of_v${OF_VERSION}_linuxaarch64_release.tar.gz"
 OF_URL="https://github.com/openframeworks/openFrameworks/releases/download/${OF_VERSION}/${OF_FILE}"
 BIN_OUT="$REPO_DIR/bin"
@@ -108,9 +108,9 @@ echo "Frontend built → $REPO_DIR/frontend/dist/"
 # ── 3. Download OpenFrameworks aarch64 release ──────────────────────────────
 echo ""
 echo "=== Downloading OpenFrameworks ${OF_VERSION} (aarch64) ==="
-mkdir -p "$REPO_DIR/.build"
+mkdir -p "$REPO_DIR/_build"
 if [ ! -d "$OF_DIR" ]; then
-  cd "$REPO_DIR/.build"
+  cd "$REPO_DIR/_build"
   [ ! -f "$OF_FILE" ] && (wget "$OF_URL" || curl -L -O "$OF_URL")
   tar -xzf "$OF_FILE"
   mv "of_v${OF_VERSION}_linux"*"_release" openFrameworks