[rin-st]

Since we're updated deps in se-2, here is the PR updating old foundry deps. Also, during the testing and sre challenges checks AI found some other smaller bugs and I decided to fix them all here in this PR.

• ethers -> viem
• fix prettier config
• fix outdated rpc endpoints
• removed outdated sre challenges from the list

forge fmt --check doesn't seem so easy test so I think it's better to fix it later in separate PR

---

Foundry counterpart of the hardhat deps refresh from scaffold-eth-2#1326, plus fixes for what surfaced while testing. No Solidity changes.

Deps (packages/foundry/package.json)

package	before	after
dotenv	~16.3.1	~18.0.5
prettier	~2.8.8	~3.9.9
qrcode	~1.5.3	~1.5.4
toml	~3.0.0	~5.0.0
shx	^0.3.4	^0.4.0
ethers	~5.7.1	removed, replaced by viem ~2.57.3
envfile	~6.18.0	removed (never imported)

Versions are picked to pass the template's npmMinimalAgeGate: 7d.

Code

• checkAccountBalance.js: viem public client (getBalance, getTransactionCount, formatEther) instead of ethers v5. ethers was used only here; viem is already the stack's client lib, has no background network detection (ethers v6 kept the process alive retrying unreachable RPCs), and retryCount: 0 keeps dead endpoints failing in ~15 ms. Error line shows HTTP <status> or the first line of the RPC error.
• generateTsAbis.js: prettier.format is async in v3.

Prettier config: .prettier.json was never read by prettier (wrong filename), so make lint / make format ran with defaults. Renamed to .prettierrc.json and formatted scripts-js with it (printWidth 120, arrowParens avoid, trailingComma all): formatting only, verified token-equivalent apart from the two files above.

foundry.toml rpc_endpoints: mainnet moved off the dead eth-mainnet.alchemyapi.io (same fix as scaffold-eth-2#1326 for hardhat), polygonMumbai → polygonAmoy (also in [etherscan]), polygonZkEvmTestnet → polygonZkEvmCardona (public RPC, the demo Alchemy key has Cardona disabled), pgn / pgnTestnet removed (network shut down). scrollSepolia currently answers 526 on sepolia-rpc.scroll.io; hardhat uses the same URL, left as is.

Checked on a generated foundry instance: yarn install, prettier --check scripts-js (the JS half of make lint) green, forge config resolves the etherscan keys, yarn deploy on anvil (dotenv + toml 5 + async prettier produce a valid deployedContracts.ts), balance/nonce loop over every rpc_endpoints entry via viem: all live networks answer, dead ones fail fast, process exits.

Extensions list (src/extensions/challenges.ts): dropped challenge-state-channels, challenge-multisig, challenge-svg-nft. Their branches no longer exist in scaffold-eth/se-2-challenges (404), so -e <name> failed. Found while checking that no challenge foundry part depends on ethers (none does; oracles / lending / stablecoins already ship viem).

Not touched: forge fmt --check still fails on the 2-space-indented example contracts vs tab_width = 4 (separate decision).

🤖 Generated with Claude Code