chore(lint): burn down remaining warnings to zero

src/audit/export.ts

@@ -1,5 +1,4 @@
-import { createReadStream, promises as fs } from 'fs';
-import { dirname, basename } from 'path';
+import { promises as fs } from 'fs';
 import type { AuditEvent, AuditQuery } from './types.js';
 
 export async function queryAuditLogs(logPath: string, query: AuditQuery): Promise<AuditEvent[]> {

src/audit/logger.ts

@@ -1,4 +1,4 @@
-import { createWriteStream, existsSync, mkdirSync, promises as fs } from 'fs';
+import { createWriteStream, existsSync, mkdirSync } from 'fs';
 import { dirname } from 'path';
 import type {
   AuditEvent,
@@ -53,14 +53,15 @@ export class AuditLogger {
   }
 
   private write(event: Omit<AuditEvent, 'timestamp'>): void {
-    if (!this.config.enabled || !this.writeStream) {
+    const writeStream = this.writeStream;
+    if (!this.config.enabled || !writeStream) {
       return;
     }
 
     this.rotator.checkRotation();
 
     const fullEvent: AuditEvent = { ...event, timestamp: Date.now() };
-    this.writeStream!.write(JSON.stringify(fullEvent) + '\n');
+    writeStream.write(JSON.stringify(fullEvent) + '\n');
   }
 
   private shouldLog(category: 'tools' | 'sessions' | 'automation', level: string): boolean {
@@ -294,9 +295,10 @@ export class AuditLogger {
   // ── Lifecycle ───────────────────────────────────────────────
 
   async close(): Promise<void> {
-    if (this.writeStream) {
+    const writeStream = this.writeStream;
+    if (writeStream) {
       await new Promise<void>((resolve) => {
-        this.writeStream!.end(() => resolve());
+        writeStream.end(() => resolve());
       });
       this.writeStream = null;
     }