docs: add Arc Transaction Memo integration example with Multi-Agent O…#182
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Summary
This PR adds an example showing how to integrate Arc's newly announced Transaction Memos feature (June 18, 2026) with an existing contract, without modifying it.
What's included
Live Verification
Tested against the MultiAgentOrchestrator contract from arc-multi-agent:
Note on signature derivation
Since the official ABI wasn't published in docs.arc.io at the time of writing, the function signature was reverse-engineered by inspecting the Memo contract bytecode dispatcher and decoding a real on-chain transaction's calldata.
Related PRs
This is the 9th example added to this series:
1-8. Foundry, X402, ERC-8004, ERC-8183, Unified Flow, Dashboard, MCP Server, Multi-Agent
9. Transaction Memo integration (this PR)