[Infrastructure] Re-enable CI/CD when ready for automated testing

[Edmon02]

Summary

GitHub Actions CI/CD workflow is currently disabled (set to workflow_dispatch only) to prevent charges.

When to Re-enable

Re-enable automatic triggers once:

• Test suite is expanded and reliable
• GitHub Actions billing is understood/acceptable
• Docker build secrets are configured

How to Re-enable

Edit .github/workflows/ci.yaml:

1. Uncomment the push/PR triggers
2. Remove or keep workflow_dispatch as backup

Current Workflow

• Lint: ruff check
• Test: pytest with CPU torch
• Docker Build: GHCR push (main only)