- Add DiscoverCheckpointsIter, FindUnscoredIter (iter.Seq2/iter.Seq)
- Add BackendsIter on Service
- Replace sort.Slice with slices.SortFunc, sort.Strings with slices.Sort
- Replace manual map-key-collect-sort with slices.Sorted(maps.Keys(...))
- Refactor ProbeCategories to use slices.Sorted with inline iterator
- Existing slice-returning methods preserved, backed by new iterators
Co-Authored-By: Gemini <noreply@google.com>
Co-Authored-By: Virgil <virgil@lethean.io>