feat(engagement): add post_engagement_metrics view + tests (#180)#232
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Per-post dashboard metrics with link_clicked as the axis (unique_readers, unique_clicks, click_rate, avg_rating, total_reactions), the derived engaged_users, and the optional ADR-0006 signals. Sources are pre-aggregated per CTE to avoid fan-out; the view is based on posts so zero-session posts show zeros and click_rate is NULL instead of dividing by zero. Access is enforced with security_invoker + an is_manager() guard. Add fixed-dataset pgTAP covering the metrics, the zero case and RBAC.
Closes #180