feat(examples): add upgradable storage contract tests

[danieljrc888]

Summary

• Add example upgradable storage contracts (v1 and v2) demonstrating on-chain code upgrades
• Add test covering deploy, state mutation, upgrade to v2, state persistence, and new method availability

Test plan

• Run uv run gltest tests/examples/tests/test_upgradable_storage.py against localnet

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 8a13f26 and 8a84a6f.

📒 Files selected for processing (3)

• tests/examples/contracts/upgradable_storage.py
• tests/examples/contracts/upgradable_storage_v2.py
• tests/examples/tests/test_upgradable_storage.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/upgradable-storage-tests

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