chore: add PR template with verification section

GitHub auto-populates this template when creating PRs. Includes:
- Summary section
- Verification report link and coverage table
- Test plan checklist

This ensures PRs consistently include verification status.

Author: rupurt

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,27 @@
+## Summary
+
+<!-- Describe what this PR does in 1-3 bullet points -->
+-
+
+## Verification
+
+<!-- Run `just verify story <ID>` and include the report link or coverage summary -->
+
+**Story:** <!-- e.g., FEAT0109 -->
+**Report:** <!-- e.g., verification/reports/coherence-verification/01-artifact-pipeline/FEAT0109.md -->
+
+| Coverage | Status |
+|----------|--------|
+| Criteria verified | /  |
+| Artifacts captured | ✅ / ⚠️ |
+
+### Uncovered (if any)
+
+<!-- List any criteria that need manual verification -->
+- [ ]
+
+## Test Plan
+
+- [ ] `just pre-commit` passes
+- [ ] `just verify story <ID>` generates report
+- [ ] Artifacts reviewed locally