feat(lab01): add pr template, initial triage report and test workflow

[RII6]

Goal

A brief description of what this PR adds or fixes (1 sentence).

Changes

• List of changes

Testing

• Description of how the functionality was tested locally (e.g., running curl 127.0.0.1:3000).

Artifacts & Screenshots

• Links to files or screenshots (if necessary).

Checklist

• Title is clear (feat(labN): style)
• No secrets/large temp files committed
• Submission file at submissions/labN.md exists