"Bigger-bet" bucket: feature-scoped issues that carry maintainer-commitment signals (milestone, roadmap, bigger-bet label).
Human-friendly explainer shown when neither bucket has results (no anchors, or anchors but no open feature opportunities). null on success.
"Quick-win" bucket: feature-scoped issues without strong commitment markers (no milestone, no roadmap, no bigger-bet labels).
OptionalratePresent when rate limits affected the search. Mirrors SearchOutput.rateLimitWarning.
Repos that qualified as anchors for this run (3+ merged PRs, configurable). Empty when the user has no anchor repos yet.