HyperEVM/Plasma chain integration follow-ups

[coderabbitai]

Context

This issue tracks follow-up work for newly added chains (HyperEVM/Plasma) based on testing feedback from shapeshift/hdwallet#756 (comment)

Testing Notes from PR #756

Working:

• Derivation works
• Swapping to HyperEVM works
• Swapping to ERC20 seems to be working but with issues
• Sending HYPE works
• Gas estimate seems to be fine

Issues Identified:

• ERC20 balances are not updated after a swap (might be fixed by rebasing on develop)
• No throttler but no rate limit noticed
• The multicall system doesn't work, need to take what was done with monad
• ERC20 balances don't seem to be fetched at start (might be the reason why they aren't updated after a swap)
• Couldn't test an ERC20 send as balance access is blocked
• Missing market-data

Action Items

1. Tackle all identified issues for newly added chains (hyperEVM/plasma)

   • Fix ERC20 balance updates after swaps
   • Implement multicall system (reference monad implementation)
   • Fix ERC20 balance fetching at start
   • Investigate and fix balance access issues

2. Revamp the chain skill with new bullet points and/or gotchas

   • Document lessons learned from recent monad fixes
   • Add integration gotchas for new EVM-compatible chains
   • Update chain integration checklist/guidelines

Reference

Original PR: shapeshift/hdwallet#756
Requester: @gomesalexandre

[gomesalexandre]

• Token things (balance not updating, balance not present initially when accounts are loaded) now fixed for Plasma and HyperEVM in develop: https://jam.dev/c/d42f9249-6d53-4085-85af-3521f77890cd
• Multicall already implemented for both in develop
• Throttler added for paranoia in feat: hyperevm throttler #11372
• Market data bits: fix: plasma market-data #11373