test(tools): fix error code assertions for collapsed call tests

The error code lives on ToolFailure.info.code, not ToolFailure.code.

packages/core/tools/tests/code-mode.spec.ts

@@ -1574,7 +1574,7 @@ describe('the run_code dispatch bridge', () => {
     })
     expect(result.isError).toBe(true)
     // eslint-disable-next-line @typescript-eslint/no-explicit-any -- error is a union type
-    expect((result.error as any).code).toBe('UNKNOWN_TOOL')
+    expect((result.error as any).info.code).toBe('UNKNOWN_TOOL')
   })
 
   it('routes a pre-aborted collapsed call through ABORTED_BEFORE_DISPATCH', async () => {
@@ -1592,7 +1592,7 @@ describe('the run_code dispatch bridge', () => {
     })
     expect(result.isError).toBe(true)
     // eslint-disable-next-line @typescript-eslint/no-explicit-any -- error is a union type
-    expect((result.error as any).code).toBe(TOOL_ABORTED_BEFORE_DISPATCH)
+    expect((result.error as any).info.code).toBe(TOOL_ABORTED_BEFORE_DISPATCH)
   })
 
 })