fix(skills): bootstrap generated lbs wrapper (#2270)

skills/scripts/bootstrap-lbs.mjs

@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+
+import { chmod, mkdir, readFile, writeFile } from "node:fs/promises";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), "..");
+const binDir = resolve(root, "bin");
+const lbsPath = resolve(binDir, "lbs");
+const wrapper = [
+  "#!/usr/bin/env bash",
+  "set -euo pipefail",
+  "",
+  'SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"',
+  'exec node "$SCRIPT_DIR/../src/lbs.ts" "$@"',
+  "",
+].join("\n");
+
+await mkdir(binDir, { recursive: true });
+
+let current = "";
+try {
+  current = await readFile(lbsPath, "utf8");
+} catch {
+  // Missing wrapper is the normal first-run path.
+}
+
+if (current !== wrapper) {
+  await writeFile(lbsPath, wrapper, "utf8");
+  await chmod(lbsPath, 0o755);
+}