fix(events): resolve TypeScript build errors

- Import EventBus/EventBusConfig types from types.js instead of bus.js
- Convert SQLite result.changes bigint to number

https://claude.ai/code/session_01NAdzND6SJEF1Fgk8dRDmAD

src/events/gateway-integration.ts

@@ -12,13 +12,8 @@
 import type { MoltbotConfig } from "../config/config.js";
 import { onAgentEvent, type AgentEventPayload } from "../infra/agent-events.js";
 import { onDiagnosticEvent, type DiagnosticEventPayload } from "../infra/diagnostic-events.js";
-import {
-  createEventBus,
-  setEventBus,
-  getEventBus,
-  type EventBus,
-  type EventBusConfig,
-} from "./bus.js";
+import { createEventBus, setEventBus, getEventBus } from "./bus.js";
+import type { EventBus, EventBusConfig } from "./types.js";
 import { createEventStore, getDefaultEventStorePath } from "./store.js";
 import { createEvent, type EventTopicMap } from "./catalog.js";
 

src/events/store.ts

@@ -249,7 +249,7 @@ export function createEventStore(config: EventStoreConfig): EventStore & {
 
   const prune = async (olderThan: number): Promise<number> => {
     const result = pruneByTimeStmt.run(olderThan);
-    return result.changes;
+    return Number(result.changes);
   };
 
   const close = (): void => {