fix(memory): use auto-incrementing id as tick proxy for recency scoring

Events recorded with tick: 0 now get a meaningful tick value from the
service's internal counter, ensuring selectForPrompt recency scoring
works correctly. Also fixed preferTypes to accept readonly arrays.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/llm/eventMemoryService.ts

@@ -6,7 +6,7 @@ export interface EventMemoryService {
   getRecentEvents(entityId: EntityId, count: number): MemoryEvent[];
   selectForPrompt(entityId: EntityId, opts: {
     maxCount: number;
-    preferTypes?: MemoryEventType[];
+    preferTypes?: readonly MemoryEventType[];
     preferEntityId?: EntityId;
   }): MemoryEvent[];
   onEventRecorded: ((entityId: EntityId, event: MemoryEvent) => void) | null;
@@ -29,9 +29,12 @@ export function createEventMemoryService(maxEvents = 50): EventMemoryService {
     onEventRecorded: null,
 
     record(entityId: EntityId, eventData: Omit<MemoryEvent, 'id'>): MemoryEvent {
+      const id = nextId++;
       const event: MemoryEvent = {
-        id: nextId++,
+        id,
         ...eventData,
+        // Use auto-incrementing id as tick proxy when caller passes 0
+        tick: eventData.tick || id,
       };
 
       const buf = getBuffer(entityId);

server/src/systems/thoughtSystem.ts

@@ -166,7 +166,7 @@ function describeRecentEvents(
 
     const events = eventMemoryService.selectForPrompt(entityId, {
       maxCount: 5,
-      preferTypes: preferTypes as any,
+      preferTypes,
     });
     if (events.length > 0) {
       return events.map(e => `- ${e.detail}`).join('\n');