Function default_transient 

pub fn default_transient(err: &RunError) -> bool

Default transient-error predicate.

Retries on NonZeroExit whose stderr contains "stale" (jj working-copy staleness) or ".lock" (git/jj lock-file contention). Never retries Spawn (binary-missing errors don’t get better) or Timeout (a hung process retried is still hung).