EXPONENTIAL
Delay grows exponentially: delay = baseDelaySeconds × 2^attemptIndex, clamped to maxDelaySeconds. With base=10s, max=300s: attemptIndex 0 → 10s; 1 → 20s; 2 → 40s; 3 → 80s; 4 → 160s; 5 onward → 300s (capped).
Delay grows exponentially: delay = baseDelaySeconds × 2^attemptIndex, clamped to maxDelaySeconds. With base=10s, max=300s: attemptIndex 0 → 10s; 1 → 20s; 2 → 40s; 3 → 80s; 4 → 160s; 5 onward → 300s (capped).