The zero-based index of the attempt that just failed.
The configured budget, when one is set.
The live retry-budget window, when a budget is configured.
The normalized failure for the attempt.
The active retry policy, or null when retries are disabled.
The raw thrown value, used for Retry-After extraction.
Whether the failed attempt was the reserved half-open breaker probe.
The inputs to computeNextRetryDelay: everything the retry-delay decision needs, so the retry loop itself stays free of delay branching.