Hannah Stulberg, a PM at DoorDash, built a shared repo where her team checks in every customer call summary, decision log, and analytics query. Last week a new engineer needed context on a customer decision from three months ago. Instead of pinging Hannah and waiting, the engineer opened the repo, asked in natural language, and got the full reasoning in 15 seconds. Hannah wasn't involved. She wasn't even online. Every PM book tells you to make yourself indispensable. Hannah did the…