Start one twenty-minute retry deadline only after an initial chunk failure, retain it across authenticated source and IP changes, and give each in-flight retry the earlier of that deadline and its ten-minute attempt limit. Expiry remains a non-quarantining transport failure.
Test Plan:
- just test
- just clippy
- three paused-time retry-deadline regressions
- git diff --check
ddidderr
a5c3a21142