chore: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- One or two sentences: what this PR does and why. -->
+
+## Changes
+
+<!-- Bullet list of notable changes. -->
+
+-
+
+## Verification
+
+<!-- Check what you actually ran/clicked. Uncheck and note what you skipped, with a reason. -->
+
+- [ ] `uv run ruff check` — clean
+- [ ] `uv run ruff format --check` — clean
+- [ ] `uv run mypy` — clean
+- [ ] `make dev` up from project root, all services healthy (if runtime affected)
+- [ ] Manually exercised the primary flow this change touches
+- [ ] Checked `make logs` (this service + downstream consumers) for new errors
+
+## Linked issues
+
+Closes #