docs(community): add GitHub contribution templates

.github/pull_request_template.md

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+## Summary
+
+- 
+
+## Testing
+
+- [ ] `bun run validate`
+- [ ] `bun run validate:ci-parity`
+- [ ] `cd ui && bun run validate` if UI changed
+- [ ] Not run
+
+## Checklist
+
+- [ ] Base branch is `dev` unless this is an approved hotfix
+- [ ] Branch name follows `feat/*`, `fix/*`, `docs/*`, or approved hotfix naming
+- [ ] Relevant `--help` output updated if CLI behavior changed
+- [ ] Tests added or updated if behavior changed
+- [ ] README or local docs updated if user-facing behavior changed
+- [ ] No secrets, tokens, or private config data are included
+
+## Docs Impact
+
+Docs impact: `none | minor | major`
+
+Action: `no update needed` or describe what doc was updated