feat: Add CI workflow for pull requests

[zubeyralmaho]

What:

Add a CI workflow that runs on pull requests to validate changes before merge.

Why:

• Currently CI only runs on release, not on PRs
• This means broken code can be merged without automated validation
• Test coverage analysis is not visible until release

How:

• Add GitHub Actions workflow for PR/push events
• Run lint, build, and test steps
• Provide fast feedback to contributors

Checklist:

• Documentation added to the docs site
• Tests
• Ready to be merged

Related PR

#76