test: align js validator use-section rules

scripts/tests/validate_skills_headings.test.js

@@ -0,0 +1,16 @@
+const assert = require('assert');
+const { hasUseSection } = require('../validate-skills');
+
+const samples = [
+  ['## When to Use', true],
+  ['## Use this skill when', true],
+  ['## When to Use This Skill', true],
+  ['## Overview', false],
+];
+
+for (const [heading, expected] of samples) {
+  const content = `\n${heading}\n- item\n`;
+  assert.strictEqual(hasUseSection(content), expected, heading);
+}
+
+console.log('ok');