fix: address review feedback

- Removed duplicate blank line in event.go
- Use original event timestamp instead of time.Now() for EventStored
- Fixed MockEventBroadcaster.Subscribe to return nil instead of closed channel
- Added integration tests for EventStored with JetStreamEventStore

Co-Authored-By: Claude Code <noreply@anthropic.com>

store/memory.go

@@ -2,7 +2,6 @@ package store
 
 import (
 	"sync"
-	"time"
 
 	"git.flowmade.one/flowmade-one/aether"
 )
@@ -12,7 +11,7 @@ type InMemoryEventStore struct {
 	mu        sync.RWMutex
 	events    map[string][]*aether.Event         // actorID -> events
 	snapshots map[string][]*aether.ActorSnapshot // actorID -> snapshots (sorted by version)
-	eventBus  aether.EventBroadcaster             // Optional EventBus for publishing EventStored
+	eventBus  aether.EventBroadcaster            // Optional EventBus for publishing EventStored
 	metrics   aether.MetricsCollector            // Optional metrics collector
 }
 
@@ -69,10 +68,10 @@ func (es *InMemoryEventStore) SaveEvent(event *aether.Event) error {
 		es.events[event.ActorID] = make([]*aether.Event, 0)
 	}
 	es.events[event.ActorID] = append(es.events[event.ActorID], event)
-	
+
 	// Publish EventStored event on success
 	es.publishEventStored(event)
-	
+
 	return nil
 }
 
@@ -86,7 +85,7 @@ func (es *InMemoryEventStore) publishEventStored(event *aether.Event) {
 		EventID:   event.ID,
 		ActorID:   event.ActorID,
 		Version:   event.Version,
-		Timestamp: time.Now(),
+		Timestamp: event.Timestamp,
 	}
 
 	// Convert EventStored to Event for publishing (internal system event)