Add pytest configuration and initial test cases for EIP-7702 transactions

[YoshihitoAso]

📌 Description

This pull request introduces automated testing infrastructure.
And also, refines terminology and logging for clarity in EIP-7702 example scripts.

✅ Related Issues

None

🔄 Changes

Testing Infrastructure

• Added a pytest test suite with fixtures for contract deployments, accounts, and web3 setup in tests/conftest.py.
• Introduced a GitHub Actions workflow (.github/workflows/pytest.yml) to automatically run tests on pull requests, including environment setup and log artifact upload on failure.
• Updated pyproject.toml to include pytest as a development dependency.
• Added a make test command to the Makefile for running the test suite.

📌 Checklist

• I have added tests where necessary.
• I have updated the documentation where necessary.

[Copilot]

Pull request overview

This PR adds a pytest-based testing setup for the EIP-7702 example flow (including positive and negative-path tests), and introduces CI automation to run the suite on pull requests.

Changes:

• Added pytest tests + fixtures for connecting to the local Hardhat chain and interacting with deployed contracts.
• Added a GitHub Actions workflow to run make test on PRs.
• Added pytest to Python dev dependencies and exposed make test.

Reviewed changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
uv.lock	Adds pytest (and transitive deps) to the resolved dev environment.
pyproject.toml	Adds pytest to the dev dependency group.
tests/conftest.py	Adds session fixtures for RPC/web3 setup and contract ABI/address wiring.
tests/test_eip7702_tx.py	Adds initial EIP-7702 “delegation then calldata execution” test coverage.
.github/workflows/pytest.yml	Adds CI job to install deps, start Hardhat, and run pytest.
Makefile	Adds make test to run pytest (after deploy).
package.json	Changes Hardhat + plugin versions (major downgrade) and updates ethers version.
package-lock.json	Locks the new Node dependency graph after the Hardhat/tooling change.
example/eip7702_one_tx.py	Logging/terminology refinement around delegation and eth_getCode output.
example/eip7702_separate_tx.py	Logging/terminology refinement around delegation and eth_getCode output.
example/RESULTS.md	Updates example output to match revised logging text.

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