pull_request_template.md

Closes #

What changed

Verification

• Bun tests, strict typecheck, static invariants, and plugin validation pass.
• The exact candidate is installed in every affected harness.
• The changed behavior passes from each real user surface.
• The installed version, action, and observed result appear below.

Live evidence:

A pull request without live evidence remains a draft. Do not merge, tag, release, or roll it out.