Reduce SDK bundle size by moving heavy viem chain imports to subpath

[ted-palmer]

Changes

• Created new /chain-utils subpath export containing:
  • configureViemChain
  • configureDynamicChains
  • fetchChainConfigs
• Removed these exports from main SDK entry to enable tree-shaking
• Reduced default backup chains from 8 to just mainnet/sepolia

Breaking Change

Consumers using configureViemChain, configureDynamicChains, or fetchChainConfigs need to update their imports:

// Before
import { configureViemChain } from '@relayprotocol/relay-sdk'

// After
import { configureViemChain } from '@relayprotocol/relay-sdk/chain-utils'

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Project	Deployment	Review	Updated (UTC)
relay-sdk-demo	Ready	Preview, Comment	Jan 7, 2026 5:43pm