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The work is complete and committed. Nothing further is needed.

Outcome. The lottery demo is built, tested, and committed as c8c38a2 on main. A fresh clone of that commit builds, passes all 119 tests, passes forge fmt --check, and dry-runs the deploy script, all offline. The report is at artifacts/report.md in the working tree and is deliberately untracked, since committing it is what got the previous attempt rejected.

What was delivered

• src/Lottery.sol: fixed-price ticket entry with exact payment, bounded rounds with an entry deadline, permissionless close and expire, coordinator-only asynchronous fulfilment, pull-based prize claims, timeout refunds, a capped fee, pause that blocks only inflows, and two-step ownership. Every wei is tracked in an escrow counter and plain transfers are rejected.
• src/mocks/MockRandomnessCoordinator.sol: clearly labelled local/testnet mock behind the coordinator interface. The operator submits the word by hand and the mock rejects duplicates.
• script/Deploy.s.sol plus script/DeploymentConfig.sol: all parameters come from committed per-chain Solidity config. The Sepolia entry keeps zero placeholders for owner and operator, and the script refuses to run until they are filled in. It also re-reads every parameter from the deployed contracts.
• Tests across nine suites cover entry, deadline boundaries, closure, authenticated fulfilment, duplicate and late deliveries, synchronous fulfilment rejection, payouts, refunds, failed payments, reentrancy on every ETH path, conservation of funds, and stateful invariants. Coverage on both source contracts is 100% for lines and branches.
• forge-std v1.16.1 is vendored as plain files with no submodule.
• The README documents pricing, transitions, permissions, who closes rounds, claim and refund triggers, a full cast play-through on Anvil, the future Sepolia procedure, and the Chainlink VRF adapter design that is still required.

Choices worth knowing

• The compiler is auto-detected from pragma ^0.8.24 with evm_version = "cancun" rather than pinned, so the offline verifier can use any cached solc at or above that version. A release profile pins 0.8.24 for reproducible deployment bytecode.
• After the timeout, both a late fulfilment and an expiry are valid and the first transaction wins. This is documented as a known limitation.
• No transactions were broadcast, no keys or funded wallets were touched, and no launch.json was produced.

Still open before any real-money use, as listed in the report: a verifiable randomness adapter to replace the mock, an independent security review, a multisig owner, final economics, an operational runbook, and a Sepolia rehearsal.