fix(v032): AiWorker Promise.all closure type narrowing 회복

Task 6 의 Promise.all 도입 시 async callback closure 가 this.telemetry?
narrowing 잃어 TS2532 발생. const telemetry = this.telemetry 로 narrowed
reference capture 후 closure 안에서 사용.

src/main/ai/AiWorker.ts

@@ -176,7 +176,8 @@ export class AiWorker {
           candidatesCount: candidates.length
         });
         if (this.telemetry) {
-          await this.telemetry.emit({
+          const telemetry = this.telemetry;
+          await telemetry.emit({
             kind: 'ai_succeeded',
             payload: {
               noteId: job.noteId,
@@ -192,13 +193,13 @@ export class AiWorker {
               if (vocabSet.has(tagName.toLowerCase())) {
                 const tagId = this.repo.getTagIdByName(tagName);
                 if (tagId !== null) {
-                  await this.telemetry.emit({
+                  await telemetry.emit({
                     kind: 'tag_vocab_hit',
                     payload: { tagId, vocabSize: vocab.length }
                   }).catch(() => {});
                 }
               } else {
-                await this.telemetry.emit({
+                await telemetry.emit({
                   kind: 'tag_vocab_miss',
                   payload: { vocabSize: vocab.length }
                 }).catch(() => {});