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Kenneth
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* feat: add post-processor pipeline to FeedEngine Add FeedPostProcessor type and FeedEnhancement interface. Post-processors run after item collection on all update paths (refresh, reactive context, reactive items). Pipeline is chained — each processor sees items as modified by the previous one. Enhancement merging handles additional items, suppression, and grouped items. Throwing processors are caught and recorded in FeedResult.errors. Co-authored-by: Ona <no-reply@ona.com> * docs: document intentional TItems cast in post-processor merge Co-authored-by: Ona <no-reply@ona.com> * fix: filter stale item IDs from groups after pipeline Groups accumulated during the pipeline can reference items that a later processor suppressed. The engine now strips stale IDs and drops empty groups before returning. Co-authored-by: Ona <no-reply@ona.com> * refactor: use reduce for stale group filtering Co-authored-by: Ona <no-reply@ona.com> --------- Co-authored-by: Ona <no-reply@ona.com>