Produces a living remediation tracker from postmortem action items — a summary dashboard (totals, completion rate, overdue/at-risk counts), items grouped by status and theme with owner/due/blocker, a thematic view, a review cadence, escalation criteria, and a bottleneck recommendation. Use when the user says "track our action items", "remediation tracker", "are our postmortem follow-ups getting done", or pastes a list of action items with owners and due dates. Use this to drive open items to completion, not to write the postmortem itself (planning/incident-postmortem) or to find cross-incident patterns (incident-trend-analysis).
