Add PR template

.gitea/pull_request_template.md

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+## Summary
+<!-- What does this PR do? Keep it brief. -->
+
+## Changes
+-
+
+## Testing
+- [ ] Tested locally
+- [ ] All CI passing
+- [ ] No security regressions
+- [ ] No performance regressions
+
+## Affected Components
+<!-- Which nodes/workers/services does this touch? -->
+
+## Squad Review
+<!-- Tag relevant agents for review -->
+<!-- @alice @cecilia @cece @aria @eve @meridian @sentinel -->
+
+---
+*BlackRoad OS — Pave Tomorrow.*