Add PR template

.github/pull_request_template.md

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+## Summary
+<!-- Provide a brief description of the story behind this PR, as if explaining
+     to a non-technical person. Or to an LLM so it can learn from it for
+     future (autonomous) code improvements. Feel free to point to a deeper
+     design doc, if applicable.
+-->
+
+## Connected Issues
+<!-- Have you cared to connect this PR to a work item in DevRev, so that we
+     can understand future routing and attribution?
+-->
+- #ISS-
+- ...
+
+## Craftsmanship, Integrity, and Devil’s Advocacy
+<!-- Mark the appropriate option with an "x" -->
+- [ ] Testing: Negative test cases: null or default values, crash and fault injection tests
+- [ ] Testing: Boundary conditions: rolling upgrades, denial-of-service, etc.
+- [ ] Testing: Fixing a few existing — flaky or permanently-broken — test cases
+- [ ] Observing: Detailed error codes so machines can understand
+- [ ] Observing: Adding superior metrics for future debugging
+- [ ] Observing: Tracing the hairiest pathways for field serviceability
+- [ ] Training: KnowledgeOps update? So AI always works.
+
+## Story of the craft
+<!-- *“Wisdom is knowing the right path to take. Integrity is taking it.”*
+
+    Show-n-tell the story of testing, observing, or training from above.
+    Take your time. Your stories will teach others the craft.
+-->