add Reactions() method to Core interface

pkg/agent/core.go

@@ -639,6 +639,17 @@ func classifyReaction(emoji string) (category, description string, positive bool
 	}
 }
 
+func (s *agent) Reactions() map[string]string {
+	result := make(map[string]string)
+	if s.session == nil {
+		return result
+	}
+	for _, reaction := range s.session.Reactions {
+		result[reaction.ResponseID] = reaction.Emoji
+	}
+	return result
+}
+
 func (s *agent) React(emoji string) {
 	_ = s.ReactTo("", emoji)
 }

pkg/agent/types.go

@@ -173,6 +173,8 @@ type Core interface {
 	React(emoji string)
 	// ReactTo records an emoji reaction to a specific assistant response.
 	ReactTo(responseID, emoji string) error
+	// Reactions returns the current response ID to emoji mapping.
+	Reactions() map[string]string
 }
 
 // DetachedInfo describes a detached process for external consumers.