add video

Author: ajm19826

math/grade5/multiply-divide-decimals.html

@@ -105,7 +105,7 @@
       title: "1. 🎬 Lab Briefing", section: "Core Protocols",
       html: `<h1>Lab Briefing: Decimal Velocity</h1>
              <p>Welcome back, Architect! Decimal vectors operate similarly to whole numbers, but require exact coordinate tracking for the decimal point. Scan this engineering transmission.</p>
-             <div class="video-container"><iframe src="https://www.youtube.com/embed/nO7mZpSg6os" frameborder="0" allowfullscreen></iframe></div>
+             <div class="video-container"><iframe src="https://www.youtube.com/embed/Htt09rY9I_A" frameborder="0" allowfullscreen></iframe></div>
              <div style="text-align:center;"><button class="btn" onclick="submitSimple()">System Core Online!</button></div>`
     },
     // --- LEVEL 1: Multiply by Whole (6) ---