chore(tooling): add CLAUDE.md (ethereum#1749)

Co-authored-by: Mario Vega <[email protected]>
Co-authored-by: felipe <[email protected]>

Author: 3 people

CHANGELOG.md

@@ -52,6 +52,7 @@ Users can select any of the artifacts depending on their testing needs for their
 - ✨ Add documentation "Running Tests" that explains the different methods available to run EEST tests and reference guides for running `consume` and `hive`: ([#1172](https://github.com/ethereum/execution-spec-tests/pull/1172)).
 - ✨ Added a new `eest` sub-command, `eest info`, to easily print a cloned EEST repository's version and the versions of relevant tools, e.g., `python`, `uv` ([#1621](https://github.com/ethereum/execution-spec-tests/pull/1621)).
 - ✨ Add `CONTRIBUTING.md` for execution-spec-tests and improve coding standards documentation ([#1604](https://github.com/ethereum/execution-spec-tests/pull/1604)).
+- ✨ Add `CLAUDE.md` to help working in @ethereum/execution-spec-tests with [Claude Code](https://docs.anthropic.com/en/docs/claude-code/overview) ([#1749](https://github.com/ethereum/execution-spec-tests/pull/1749)).
 - ✨ Use `codespell` instead of `pyspelling` to spell-check python and markdown sources ([#1715](https://github.com/ethereum/execution-spec-tests/pull/1715)).
 - 🔀 Updated from pytest 7 to [pytest 8](https://docs.pytest.org/en/stable/changelog.html#features-and-improvements), benefits include improved type hinting and hook typing, stricter mark handling, and clearer error messages for plugin and metadata development ([#1433](https://github.com/ethereum/execution-spec-tests/pull/1433)).
 - 🐞 Fix bug in ported-from plugin and coverage script that made PRs fail with modified tests that contained no ported tests ([#1661](https://github.com/ethereum/execution-spec-tests/pull/1661)).