A program can pass every local test and still be a long way from ready for real users.
It needs to be deployed to the right network, with sensible controls over who can change it. Other developers need a reliable way to call it. Users need a frontend that can connect to their wallet and submit transactions. When those transactions fail, the app needs to explain what happened.
Arc 13 covered that last stretch.
Across Days 85–91, we deployed a program to mainnet-beta, secured its upgrade authority, published its interface, generated a typed client, built a wallet-connected frontend and improved the way it handled transaction failures.
Then we made the launch public, with an on-chain address anyone could verify.
