Add failure artifact upload to smoke-test workflow

Goal

Add a GitHub Actions step that uploads the generated smoke-test artifacts when the install smoke test fails.

Why

The new workflow proves the install path works, but failure artifacts would make debugging much faster.

Scope

• Update .github/workflows/smoke-test.yml
• Upload install.log, field-arrive.log, and field-pulse.log on failure
• Keep the workflow simple and low-maintenance

Done when

• Failed runs retain enough logs to diagnose the breakage quickly