docs(readme): fix provider.request usage in Basic SDK Usage

[3822802]

Summary

Two issues in the Basic SDK Usage snippets in the README that will not work as written.

1. Missing await (step 3)

const addresses = provider.request({
  method: 'eth_requestAccounts',
});

request() returns Promise<unknown>, so addresses is a Promise, not an array. Step 4 then reads addresses[0], which is undefined.

2. Wrong call signature (step 4)

provider.request('personal_sign', [ ... ]);

The provider interface takes a single RequestArguments object, not positional arguments:

// packages/account-sdk/src/core/provider/interface.ts
export interface RequestArguments {
  readonly method: string;
  readonly params?: readonly unknown[] | object;
}

request(args: RequestArguments): Promise<unknown>;

Passing ('personal_sign', [...]) means args is the string 'personal_sign' and args.method is undefined.

This is also inconsistent with step 3 in the same section, which already uses the object form.

Fix

Adds the missing await and switches step 4 to the object form, matching both the type definition and EIP-1193.

[cb-heimdall]

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