docs: add missing await to README provider.request() examples

[golldyck]

Problem

Two quickstart code blocks in README.md (lines 176, 184) and the duplicated block in packages/account-sdk/README.md (lines 81, 89) call provider.request() without await. Per packages/account-sdk/src/core/provider/interface.ts the Provider signature is request(args: RequestArguments): Promise<unknown>, so the examples as written assign a Promise to addresses and the following step indexes it as addresses[0] — which is undefined. The personal_sign call in step 4 is also fire-and-forget.

Fix

Added await to both provider.request() invocations in both READMEs so the quickstart actually works when copied.

Changes

• README.md — Prefixed await on the eth_requestAccounts call (line 176) and on the personal_sign call (line 184) in the Basic SDK Usage section
• packages/account-sdk/README.md — Same fix applied to the mirrored quickstart (lines 81, 89)

Testing

• Verified request is typed as request(args: RequestArguments): Promise<unknown>; in packages/account-sdk/src/core/provider/interface.ts
• Confirmed without await, addresses[0] in the personal_sign step is undefined
• Checked no other README code blocks use provider.request without awaiting

Closes #272

[cb-heimdall]

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