Fixes/partner reviews

[pradeep-selvaraju]

Note

Medium Risk
Moderate risk because it changes signature/hash generation to async WebCrypto and updates response typings, which can affect auth and downstream integrations if runtime support or outputs differ.

Overview
Switches cryptographic helpers from Node crypto to async WebCrypto: buildPolyHmacSignature and generateOrderBookSummaryHash now use globalThis.crypto.subtle, making createL2Headers and ClobClient.getOrderBookHash async and updating the example/test call sites accordingly.

Updates API response types to match newer server payloads (optional transactionsHashes, new tradeIDs, builder fee fields, nano timestamps, nullable/optional flags, and BalanceAllowanceResponse.allowances), removes client-side request error logging, bumps package version to 1.0.4, and sets node >=20.10 in package.json.

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