Manage parallel Xcode checkouts

- iOS engineer Jacob Bartlett described how multiple repo checkouts and derived data in Xcode increase latency and hamper parallel work. - He highlights that build/test delays and derived-data bloat make context switching expensive for feature work spanning repos. - Remedies include repo-layout changes, derived-data strategies and CI gating to reduce developer context-switch cost and speed cross-repo contribution. (x.com/jacobtechtavern/status/2049520363986374802)