Set up CI pipeline with cargo build, test, fmt, and clippy checks

[AbdulSnk]

Overview

This issue involves setting up a GitHub Actions CI pipeline for the streamforge-contract repository to automate code quality checks on every pull request.

What needs to be done

• Create a .github/workflows/ci.yml file
• Configure the pipeline to run the following on every PR:
  • cargo build --all — ensures the project compiles
  • cargo test --all — runs all tests
  • cargo fmt --check — enforces code formatting
  • cargo clippy -- -D warnings — catches code quality issues

Acceptance Criteria

• CI workflow file exists at .github/workflows/ci.yml
• Pipeline triggers on every pull request to main
• All four cargo checks run and must pass before a PR can merge
• Pipeline passes on the current codebase

Pre-Submission Checklist

Before submitting your PR, confirm:

• I have run cargo build locally and it succeeds
• I have run cargo test locally and all tests pass
• I have run cargo fmt to format my code
• I have run cargo clippy and fixed all warnings

Notes

This is a great first issue for anyone familiar with GitHub Actions and Rust tooling.