Function is_recoverable_tab_failure 

pub fn is_recoverable_tab_failure(err: &Error) -> bool

Single shared predicate for “the tab the op targeted is dead; one recover-and-retry round is appropriate.” Used by with_scratch_recovery, with_named_tab_recovery, and the origin-bound evaluate helper. Keeping these in one place avoids the call sites drifting apart on what counts as recoverable.