feat: introduce new quality gates, Node.js syntax checks, and manual smoke test status validation

tests/scripts/check-node-split-syntax.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/../.." && pwd)"
+TARGETS_FILE="${1:-$ROOT_DIR/plans/node-syntax-gate-targets.txt}"
+
+if [[ ! -f "$TARGETS_FILE" ]]; then
+  echo "missing targets file: $TARGETS_FILE" >&2
+  exit 1
+fi
+
+checked=0
+missing=0
+invalid=0
+
+while IFS= read -r file; do
+  [[ -z "$file" ]] && continue
+  [[ "${file:0:1}" == "#" ]] && continue
+
+  checked=$((checked + 1))
+  abs="$ROOT_DIR/$file"
+  if [[ ! -f "$abs" ]]; then
+    echo "MISSING $file"
+    missing=$((missing + 1))
+    continue
+  fi
+
+  if ! node --check "$abs"; then
+    echo "INVALID $file"
+    invalid=$((invalid + 1))
+  fi
+done < "$TARGETS_FILE"
+
+echo "checked=$checked missing=$missing invalid=$invalid"
+
+if (( missing > 0 || invalid > 0 )); then
+  exit 1
+fi