Actions CLI - Initial scaffolding

[its-everdred]

Implements #408. Scaffolds packages/cli/ (npm actions-cli, bin actions): agent-first subprocess that emits JSON on stdout and JSON error envelopes on stderr, with five exit-code categories. Next up: #409 (lend), #410 (swap), #422 (smart wallet + periphery).

What's in

• packages/cli/ wired into the pnpm workspace
• commander tree: assets, chains, wallet address, wallet balance
• writeJson (bigint-aware) + writeError with CliError taxonomy and safeDetails redaction
• Lazy requireEnv - cleanEnv never runs at import time, enforced by spy test
• EOA wallet via actions.wallet.toActionsWallet(localAccount) - no bundler, no UserOps, signer pays gas
• Demo config mirrors backend (USDC_DEMO, OP_DEMO, ETH; GauntletUSDCDemo, AaveETH; Base Sepolia, OP Sepolia, Unichain)
• --chain <shortname> / --chain-id <id> flags on wallet balance, mutually exclusive via the shared resolveChainFlags resolver
• SKILL.md (Agent Skills spec) + README.md
• picocolors scoped to --help only; stdout JSON stays ANSI-free
• 78 tests pass (71 unit + 7 spawn-based system tests against built dist/index.js)

SDK -> CLI mapping

actions.getSupportedAssets()                -> actions assets
config.chains                               -> actions chains
wallet.address (EOA from PRIVATE_KEY)       -> actions wallet address
wallet.getBalance()                         -> actions wallet balance [--chain <name> | --chain-id <id>]

# coming in #409 / #410:
actions.lend.getMarkets()                   -> actions lend markets
actions.lend.openPosition({marketId, ...})  -> actions wallet lend open --market GauntletUSDCDemo --amount 10
actions.lend.closePosition({marketId, ...}) -> actions wallet lend close --market GauntletUSDCDemo --amount 10
actions.swap.getQuote({...})                -> actions swap quote --in USDC_DEMO --out OP_DEMO --chain base-sepolia --amount 5
wallet.swap.execute({...})                  -> actions wallet swap execute --in USDC_DEMO --out OP_DEMO --chain base-sepolia --amount 5

Wallet model

EOA only in this PR. actions.wallet.toActionsWallet(localAccount) wraps the signer in a LocalWallet; transactions are signed and submitted directly (no bundler, no UserOps, signer pays gas from its own ETH balance on Base Sepolia). Lend and swap dispatch through wallet.sendBatch, which EOAWallet implements as sequential sends with nonce confirmations - approvals + calls become multiple transactions instead of one batched UserOp.

#422 re-adds the ERC-4337 smart wallet path + the direct wallet commands (wallet send, send-batch, transfer from #413) once bundlers are wired.

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[its-everdred]

Since actions sdk will need to retain a list of supported chains anyway, id prefer this moved to the sdk in a future PR

[its-everdred]

a future PR will abstract these away and simply use the values set in the ActionsConfig.chains object

[its-everdred]

In a future PR, we wont be so opinionated about wallet setup

[its-everdred]

A future PR moves this config and the other demo files out of the CLI into opie, the example consumer of the CLI.