chore: add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Provide a brief description of the changes in this PR -->
+
+## Related Issue
+
+<!-- Link to the Linear ticket this PR addresses -->
+Closes ENG-XXXX
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Refactoring (no functional changes)
+- [ ] Documentation update
+- [ ] CI/CD or tooling changes
+
+## Changes Made
+
+<!-- List the key changes made in this PR -->
+
+- 
+
+## Testing
+
+<!-- Describe the testing performed -->
+
+- [ ] Unit tests pass (`cargo test`)
+- [ ] Integration tests pass (if applicable)
+- [ ] New tests added for new functionality
+
+## Shared Components Checklist
+
+<!-- Checklist specific to shared node components -->
+
+- [ ] Changes are backwards compatible with consuming repos
+- [ ] Public API changes are intentional and documented
+- [ ] Downstream impact assessed (signet-node, builder, etc.)
+- [ ] Trait changes reviewed for compatibility
+- [ ] Feature flags documented (if new ones added)
+- [ ] Version bump considered (semver)
+
+## Code Quality
+
+- [ ] Code follows the project's style guidelines
+- [ ] Self-review completed
+- [ ] Comments added for complex logic
+- [ ] No unnecessary debug/print statements
+- [ ] Error handling is appropriate
+
+## Documentation
+
+- [ ] README updated (if needed)
+- [ ] Rustdoc comments added for public items
+- [ ] CHANGELOG updated (if applicable)
+- [ ] Migration notes provided (for breaking changes)
+
+## Pre-Submit Checklist
+
+- [ ] `cargo fmt --check` passes
+- [ ] `cargo clippy` passes without warnings
+- [ ] All CI checks pass
+- [ ] Branch is up to date with main
+
+## Additional Notes
+
+<!-- Any additional context, screenshots, or information for reviewers -->
+