At 8:17 on a Tuesday morning, a store administrator sent me a message: “Why has our best-selling product disappeared from search?” That sentence made my stomach tighten. Six days earlier, I had called the launch clean. The new theme was live. Checkout worked. Mobile pages felt quick. The redirects we knew about had passed our tests. I had even shared a screenshot of the performance report with several green circles on it. Now the store's most reliable organic landing page was lo...