test: add multi-transaction ERC20 integration test

[giwaov]

Summary

Adds a new integration test that deploys a single \LlmErc20\ contract and runs multiple sequential transactions against it, verifying balances and total supply preservation after each transfer.

Changes

• New test file: \ ests/integration/icontracts/tests/test_multi_tx_erc20.py\

Test Scenario

1. Deploy ERC20 with 1000 token supply to Account A
2. Tx 1: A transfers 100 to B - verify balances
3. Tx 2: A transfers 200 to C - verify balances
4. Tx 3: B transfers 50 to C (using \connect()\ to switch sender) - verify balances
5. Final assertion: total supply (1000) is preserved across all accounts

This catches potential race conditions or state corruption when multiple writes hit the same contract sequentially, as described in issue #441.

Labels

This issue is tagged \good first issue.

Related Issue

Closes #441

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ebd3d9b2-16cc-497d-81a3-ab8f3ff0ee11

📥 Commits

Reviewing files that changed from the base of the PR and between cd554a6 and eabb1b8.

📒 Files selected for processing (1)

• tests/integration/icontracts/tests/test_multi_tx_erc20.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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