Release: ABI / contract-interface snapshot tests to catch breaking spec changes

[joelpeace48-cell]

Context

Frontend, backend, and partner SDKs depend on the contract interface. A silent signature/spec change
breaks integrators. There is no snapshot test pinning the contract spec.

Scope

• Export the contract spec (env meta / interface) and snapshot it in CI.
• Fail the build on any unintended interface change; require an explicit version bump + changelog.
• Generate typed bindings from the pinned spec.

Acceptance criteria

• Any interface change requires updating the snapshot + bumping the documented version.

Verification

• Changing a function signature without updating the snapshot fails CI.

[spiffamani]

I'm a full-stack Software Engineer
I'd love to take this on — thanks for considering me

[gloskull]

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process. My PR will be submitted in under 10hours.