Implement global contract version migration compatibility matrix tests

[Baskarayelu]

Description

Add workspace-level compatibility tests that validate contract version evolution and migration assumptions.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Cover version changes across core contract crates

Suggested execution

• Fork the repo and create a branch
• git checkout -b test/workspace-version-matrix-compatibility
• Implement changes
• Write contract: Cargo.toml, integration_tests/tests/multi_contract_integration.rs
• Write comprehensive tests: integration_tests/tests/multi_contract_integration.rs
• Add documentation: VERSION_COMPATIBILITY.md
• Include NatSpec-style comments
• Validate security assumptions

Test and commit

• Run tests: cargo test -p integration_tests
• Cover edge cases
• Include test output and security notes

Example commit message

test: add workspace contract version migration compatibility matrix

Guidelines

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours

[midenotch]

@midenotch has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I will fix this issues and ensure clean, reliable code with strong test coverage and proper documentation as outlined.
I'm comfortable working within tight timelines and ready to deliver within the 24-hour window

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Congratulations, @midenotch! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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