GC syncs ad chains by segment

[gammazero]

Ad chains my be very long, so it is necessary to sync them by segment.

[codecov-commenter]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (9b8261a) 46.96% compared to head (6b1a8e5) 46.84%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
ipni-gc/reaper/reaper.go	18.60%	33 Missing and 2 partials ⚠️
ipni-gc/reaper/option.go	14.28%	6 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2464      +/-   ##
==========================================
- Coverage   46.96%   46.84%   -0.13%     
==========================================
  Files          85       85              
  Lines       10737    10769      +32     
==========================================
+ Hits         5043     5045       +2     
- Misses       5094     5124      +30     
  Partials      600      600              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.