Here's precisely how the electric vehicle maker plans to reach its biggest goal of 2024 without increasing production.Investors in electric vehicle (EV) start-ups are accustomed to tracking production and deliveries to follow their growth and to better understand industry demand. Rivian (RIVN -4.60%) disappointed its shareholders when it announced that its production and deliveries would be flat year over year in 2024, but that doesn't mean there isn't something critical for investors to watch.Rivian's bigg ...