chore(lint): restore zero-error eslint baseline

src/tools/executor.test.ts

@@ -47,7 +47,7 @@ const cancellableTool: Tool = {
   description: 'Long-running cancellable tool',
   inputSchema: { type: 'object', properties: {} },
   execute: async (_args, context) => {
-    return await new Promise((resolve) => {
+    return new Promise((resolve) => {
       const onAbort = () => resolve({ success: false, output: '', error: 'aborted' });
       if (context?.signal?.aborted) {
         onAbort();
@@ -65,7 +65,7 @@ function createSideEffectTool(sideEffect: { fired: boolean }): Tool {
     description: 'Cancellable side effect',
     inputSchema: { type: 'object', properties: {} },
     execute: async (_args, context) => {
-      return await new Promise((resolve) => {
+      return new Promise((resolve) => {
         const timer = setTimeout(() => {
           sideEffect.fired = true;
           resolve({ success: true, output: 'side effect fired' });