I let AI write my code for a month. The junior devs caught what it broke — I didn't.

Everyone's posting about how AI made them 10x faster. Here's the part nobody screenshots — a month of AI-assisted code where the regressions were silent, plausible, and mine to own. The juniors on the team caught three of them. I caught none. Here's what that taught me about where AI actually helps and where it quietly hurts.