[Wave 9] Add event round-trip fixtures for all contract consumers

[truthixify]

Problem

The source contracts, ABIs, bindings, subgraph, and SDK parsers can drift even when each project builds independently.

Done when

• Define canonical event fixtures for EVM and Stellar announcements, sends, withdrawals, and names.
• Decode and re-encode them through bindings and consumer parsers.
• Assert indexed fields, topic order, metadata, and amounts.
• Run the conformance fixtures in CI.

[attyolu]

@attyolu has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hello Maintainer. Please assign this task to me. I'm grateful

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[playmaker410]

@playmaker410 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I wouldd love to take this on. I have hands-on experience with Rust, Soroban, Cairo, and TypeScript, and I’m confident I can deliver a solid solution within 24 hours.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @playmaker410 to this issue.

[ASIDISG]

@ASIDISG has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi, maintainer, please kindly assign!!

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