fix(git diff): improve git diff

ts/classes.aidoc.ts

@@ -64,7 +64,7 @@ export class AiDoc {
         await this.npmextraKV.writeKey('OPENAI_TOKEN', this.openaiToken);
       }
     }
-    if (!this.openaiToken) {
+    if (!this.openaiToken && this.npmextraKV) {
       this.openaiToken = await this.npmextraKV.readKey('OPENAI_TOKEN');
     }
 
@@ -76,7 +76,11 @@ export class AiDoc {
   }
 
   public async stop() {
-    await this.openaiInstance.stop();
+    if (this.openaiInstance) {
+      await this.openaiInstance.stop();
+    }
+    // No explicit cleanup needed for npmextraKV or aidocInteract
+    // They don't keep event loop alive
   }
 
   public async buildReadme(projectDirArg: string) {