feat: add feedback acknowledgement

internal/server/server.go

@@ -314,9 +314,10 @@ func (s *Server) setupRouter() {
 	// ever needs to change.
 	if s.statsH != nil {
 		r.Get("/stats", s.statsH.Render)
-		// One-way "mark resolved" per feedback row — POST so a refresh of
-		// /stats can't replay it, and it lives at the same public access
-		// level as /stats itself (gate both together if that changes).
+		// One-way per-row feedback actions — POST so a refresh of /stats
+		// can't replay them. Both live at the same public access level as
+		// /stats itself (gate them together if that ever changes).
+		r.Post("/stats/feedback/{id}/acknowledge", s.statsH.AcknowledgeFeedback)
 		r.Post("/stats/feedback/{id}/resolve", s.statsH.ResolveFeedback)
 	}