feat(repo): add yaml validation pre-commit hook

scripts/lint-yaml.js

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+
+import fs from "node:fs";
+import yaml from "js-yaml";
+
+const files = process.argv.slice(2);
+let hasError = false;
+
+if (files.length === 0) {
+  process.exit(0);
+}
+
+for (const file of files) {
+  try {
+    const content = fs.readFileSync(file, "utf8");
+    yaml.load(content);
+    console.log(`✓ ${file} is valid`);
+  } catch (e) {
+    console.error(`✗ ${file} is invalid: ${e.message}`);
+    hasError = true;
+  }
+}
+
+if (hasError) {
+  process.exit(1);
+}