Event-loop turns run to completion, so I/O on shared, remote, or slow
state belongs between turns (async); synchronous access is fine only for
state local, prompt, and private to the actor, such as a Durable
Object's SQLite. Sourced from Miller, Tribble & Shapiro, "Concurrency
Among Strangers" (TGC 2005), §5.2 and §6 footnote 5.
Generated-by: Claude Opus 5.5
