CI: build WASM and test predictify-hybrid

[greatest0fallt1me]

Description

• PRs must run cargo test -p predictify-hybrid and Soroban WASM build.

Requirements and context

• Must be secure, tested, and documented.
• Should be efficient and easy to review for auditors and integrators.
• Scope is Predictify Hybrid Soroban smart contracts in predictify-contracts only (no frontend or backend services).

Suggested execution

• Fork the repository and create a branch:
  • git checkout -b feature/ci-contracts
• Implement changes:
  1. Contract / module: update logic in .github/workflows/contracts.yml and related modules as required.
  2. Tests: extend or add CI (and supporting test utilities under contracts/predictify-hybrid/src/tests/ when applicable).
  3. Documentation: update or add README.md; add a link from docs/README.md when adding new top-level docs.
  4. Comments: use Rust doc comments (///, //!) on all new or changed public contract API — equivalent discipline to NatSpec for Solidity.

Primary touchpoints: .github/workflows/contracts.yml

Test and commit

• Run cargo test -p predictify-hybrid and narrow with filters while iterating.
• Add regression tests for every bug or ambiguity found during review.
• In the PR, include summarized test output and short security notes (threat model, invariants proven, explicit non-goals).

Example commit message

ci: contract wasm build and tests

Guidelines

• Target ≥ 95% line coverage on modules touched (e.g. cargo llvm-cov / cargo tarpaulin per repo conventions).
• Documentation must be sufficient for an external integrator without reading all Rust internals.
• Timeframe: 96 hours from assignment.

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[tabithaglitch]

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

Good day maintainer, please I'd love to work on this project sir. I'd ensure I send them ASAP 😊

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