Expose public client for chain via Actions SDK

[its-applekid]

Summary

Closes #232

Exposes the internal ChainManager.getPublicClient() method through the Actions class, allowing SDK consumers to access viem PublicClient instances for making on-chain calls without creating their own clients.

Motivation

As noted in #230 (discussion), developers currently need to manually create public clients with createPublicClient() to interact with on-chain contracts, even though the Actions SDK already manages properly configured clients internally. This leads to duplicated client creation logic and potentially misconfigured transports.

Changes

• packages/sdk/src/actions.ts: Added getPublicClient(chainId) method that delegates to ChainManager
• packages/sdk/src/index.ts: Re-exported PublicClient type from viem for consumer convenience
• packages/sdk/src/__tests__/actions.test.ts: Added unit tests for the new method:
  • Returns PublicClient for configured chain
  • Throws error for unsupported chain
  • Returns same cached instance on repeated calls
  • Integration test: makes real on-chain call (external test)

Usage

const actions = new Actions(config, deps)

// Get a public client for Optimism
const publicClient = actions.getPublicClient(10)

// Use it for on-chain calls
const blockNumber = await publicClient.getBlockNumber()
const balance = await publicClient.getBalance({ address: '0x...' })

Testing

• Build: ✅
• Lint: ✅ (0 errors)
• Tests: ✅ (442 passed, 11 skipped)

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[jefr90]

Thanks. Closing this for now: we haven't landed on a clear consumer use case for exposing the public client directly via the SDK. Happy to revisit when there's a concrete reason to surface it.