Tests: rpc initial setup and rpc tests phase 1

[kollegian]

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Testing performed to validate your change

[cursor]

PR Summary

Low Risk
Changes are limited to integration tests and CI orchestration; no production RPC or node logic is modified, though the new matrix job adds runtime and geth dependency to CI.

Overview
Adds a self-contained integration_test/rpc_tests module that compares Sei’s EVM JSON-RPC to a local geth --dev reference (happy paths, response shape, and byte-for-byte JSON-RPC errors via raw transport). A one-time bootstrap deploys shared fixtures, mirrors TestERC20 on geth, pre-funds a signer pool into runtime/runtime.json, and optional CW20/wasm fixtures when enabled.

Phase 1 covers many eth_* methods (e.g. eth_call, blocks, balances, gas/fee APIs, eth_coinbase, EIP-7702 delegation) with shared rich-block helpers and documented Sei/geth divergences where messages differ.

CI: new matrix job EVM RPC Parity (geth reference) runs scripts/run-ci.sh (deps, compile, start geth, bootstrap + serial run, merged mochawesome report); integration workflow bumps Node 22 / setup-node@v4 and uploads reports/merged as an artifact when present.

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 12, 2026, 4:09 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.17%. Comparing base (2151ba0) to head (d297570).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3520      +/-   ##
==========================================
- Coverage   59.12%   58.17%   -0.96%     
==========================================
  Files        2213     2129      -84     
  Lines      182814   173668    -9146     
==========================================
- Hits       108096   101036    -7060     
+ Misses      64993    63642    -1351     
+ Partials     9725     8990     -735     

Flag	Coverage Δ
sei-db	70.62% <ø> (+0.21%)	⬆️
sei-db-state-db	?

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[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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