CLI: Lend commands

[its-everdred]

Fixes #409. Adds the lend namespace on top of the CLI scaffolding: read-only actions lend markets / actions lend market and wallet-scoped wallet lend open / close / position.

SDK → CLI

actions.lend.getMarkets({asset?, chainId?})   -> actions lend markets [--asset <s>] [--chain <n>]
actions.lend.getMarket({address, chainId})    -> actions lend market --market <name>
wallet.lend.getPosition({marketId})           -> actions wallet lend position --market <name>
wallet.lend.openPosition({..., approvalMode}) -> actions wallet lend open --market <n> --amount <n> [--approval-mode <exact|max>]
wallet.lend.closePosition({...})              -> actions wallet lend close --market <n> (--amount <n> | --max)

Output

{
  "action": "open",
  "market": { "name": "Gauntlet USDC", "address": "0x...", "chainId": 84532, "provider": "morpho" },
  "asset":  { "symbol": "USDC_DEMO" },
  "amount": 10,
  "transactions": [ { "transactionHash": "0x...", "status": "success", ... } ]
}

transactions is always an array (1-2 receipts on EOA: optional approval + position call). Read commands return the SDK shape verbatim with bigints stringified.

Notable

• Typed ActionsError mapping in output/errors.ts — ChainNotSupportedError, InvalidParamsError, ProviderNotConfiguredError etc. become structured validation / config envelopes; viem ContractFunctionRevertedError becomes onchain.
• Default-deny receipts — anything that isn't status === 'success' (EOA) or success === true (UserOp) becomes code: "onchain" exit 5; a misbehaving RPC can't silently report success.
• Strict --amount — rejects scientific notation, hex, signs, whitespace, bigint suffixes, and integer parts above MAX_SAFE_INTEGER.
• Market collision detection — two providers normalising to the same name throw validation instead of silently picking the first.
• Generic helpers (parseAmount, WalletTransactionReceipt, toReceiptArray, ensureOnchainSuccess) live in cli/src/utils/. open and close share a runLendAction backbone.

159 tests pass.

Out of scope (follow-ups)

• lendProvider on the read-side LendMarket payload — needs an SDK field.
• Post-trade LendMarketPosition in the open/close envelope — extra RPC per write.
• Typed getLendProviders(config) SDK accessor so the CLI doesn't string-skip the settings sibling.

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[its-everdred]

DRY, import this from 1 place