Validate Stellar RPC responses before event-processing pipeline (#630)

[Jessepriase]

Reject malformed GetEvents RPC responses at the listener boundary so unexpected structures never reach downstream event processing. Invalid responses are logged and skipped without crashing the listener.

Overview

Related Issue

Closes #

Changes

Verification

# e.g.
cd dashboard && npm test
cd listener && npm run typecheck && npm test
cd contract/contracts/hello-world && cargo test

How to Test

Checklist

• Branch is up to date with main
• Tests added/updated and all pass locally
• cargo fmt --all run (if Rust changes)
• npm run lint passes (if TypeScript changes)
• Documentation updated if behavior changed
  closes Validate Stellar RPC Responses #630

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