docs: add arc-agent-sdk example — TypeScript SDK for Arc Testnet Agent Economy contracts

[consumeobeydie]

Summary

Adds a TypeScript example demonstrating the @consumeobeydie/arc-agent-sdk package — a community-built SDK for interacting with Arc Testnet Agent Economy contracts.

What this example covers

• AgentIdentity (ERC-8004) — register agent, record missions, get success rate
• SpendingLimits — set daily/weekly/per-tx limits, canSpend check, remainingDaily
• SplitPayment — create revenue splits (70% agent / 30% treasury)
• EventLogger + Memo — on-chain logging with structured metadata (Arc v0.7.2)

SDK

npm install @consumeobeydie/arc-agent-sdk

• npm: https://www.npmjs.com/package/@consumeobeydie/arc-agent-sdk
• GitHub: https://github.com/consumeobeydie/arc-agent-sdk

Contracts (Arc Testnet)

Contract	Address
AgentIdentity	0x5275783cD74eC21739Af8f3be9c42C024F671cFb
SpendingLimits	0x615a4B25448980a6b518f9F9088C206387535192
SplitPayment	0x775D4DF117f0B63a16ade4185bDa221Adcb4AEA3
EventLogger	0x9C50765e591663ED541B2fB863626f39fC6C12e0

[osr21]

Thanks for putting this example together — nice demonstration of the Agent Economy primitives (identity, spending limits, split payments, event logging) working together on Arc Testnet.

A couple of considerations for reviewers before merging:

• The contract addresses referenced (AgentIdentity, SpendingLimits, SplitPayment, EventLogger) appear to be a separate, community-deployed set on Arc Testnet, distinct from Circle's own reference deployments. It may be worth calling that out explicitly in the docs so readers don't mistake them for an official/canonical deployment.
• Since @consumeobeydie/arc-agent-sdk is a third-party package, it might be worth adding a short disclaimer noting it hasn't been audited or formally endorsed by Circle, so inclusion in this repo isn't read as an implicit security review.

Otherwise this is a helpful addition for anyone exploring the Agent Economy pattern on Arc.

[consumeobeydie]

I've been building on Arc Testnet for the past few months. Here's a full overview of my contributions:
GitHub: https://github.com/consumeobeydie/arc-testnet-journey
Highlights:

27+ contracts deployed (ArcDEX AMM, ERC-8004, SpendingLimits, SplitPayment, ArcUSDCVault)
First AMM on Arc Testnet (USDC/EURC pool)
npm SDK: @consumeobeydie/arc-agent-sdk
MPP × Arc integration: https://arc-mpp-demo.vercel.app/
Full Circle Console coverage
Live pitch: https://arc-intelligence-dashboard.vercel.app/pitch