Two big TV OS items have landed in recent days, which should interest anyone invested in the battle for big screen real estate. The most pressing news is that The Trade Desk has found an unlikely partner for its Ventura OS, in the form of US pay TV operator DirecTV—injecting some much-needed adrenaline into a venture which had stalled before even rolling off the production line. Second, Amazon’s long-awaited proprietary TV OS, coined Vega, finally has legs, which sees the start of the Firestick slinger’s abandonment of Android in place of a fully in-house operating system. Amazon describes Vega as “responsive and highly efficient”. But first, The Trade Desk needs addressing. Together with DirecTV, a custom version of the Linux-based…