Get Owner Claims Summary

List every claim on activities the caller can manage, bucketed by canonical status group. Sorted newest-first within each bucket; capped per-bucket by ?limit (default 50, max 200).

Returns: { "pending": [ {claim_id, activity_id, activity_title, claimant_name, claimant_email, claim_status, status_label, created_at, owner_review_deadline}, ... ], "in_pipeline": [...], "resolved": [...], "counts": { "pending": N, "in_pipeline": M, "resolved": K }, "generated_at": ISO timestamp, }