feat: erc8004 identity & reputation

[andrew-virtuals]

Note

Medium Risk
Adds new on-chain signing/transaction flows (ERC-8004 registration and reputation reviews) and temporarily switches the active wallet, which can affect user funds/identity if misused or if chain selection/typed-data signing is wrong.

Overview
Adds ERC-8004 identity support to the CLI via acp agent register-erc8004, including an end-to-end flow that fetches backend-prepared registration data, sends either a transaction or EIP-712 signature, and then confirms registration with the API; agent creation now attempts auto-registration after signer setup.

Adds job reviews/reputation via acp client review, validating rating/text, requesting feedback transaction data from the API, submitting an on-chain call when required (otherwise recording off-chain), then confirming feedback with the API.

Extends API types/endpoints to include erc8004AgentId on agent chains plus new AgentApi methods for ERC-8004 registration and job feedback, and updates docs (README.md, SKILL.md) to document both commands and behaviors.

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