chore: bump wallet api schema

[jakehobbs]

Description

Remove webauthn support, multiple UOs in wallet_sendPreparedCalls, and adds experimental support for ERC-8021.

Related Issues

Changes Made

Testing

• I have tested these changes locally
• I have run the validation scripts (pnpm run validate)
• I have checked that the documentation builds correctly

[github-actions]

🌿 Documentation Preview

Name	Status	Preview	Updated (UTC)
Alchemy Docs	✅ Ready	🔗 Visit Preview	Feb 13, 2026, 7:12 PM

[Copilot]

Pull request overview

This PR updates the Alchemy Wallet API schema to remove WebAuthn support, simplify the wallet_sendPreparedCalls method to handle a single user operation instead of multiple, and add experimental ERC-8021 transaction attribution support across relevant methods.

Changes:

• Removed all WebAuthn-related types and signatures including webauthn-p256 signer types, WebAuthn public key structures, and MAv2.0.0-ma-webauthn account types
• Changed wallet_sendPreparedCalls response from "user-operations" (plural, array) to "user-operation" (singular, object)
• Added experimental_dataSuffix capability for ERC-8021 transaction attribution across multiple methods (wallet_prepareCalls, wallet_requestQuote_v0, and related swap methods)
• Simplified wallet_listAccounts to only accept signerAddress parameter, removing WebAuthn signerPublicKey option

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