Add feature pull request template

Add a pull request template for new features with sections for description, implementation notes, testing, and a checklist.

Author: asong56

.github/PULL_REQUEST_TEMPLATE/feature.md

@@ -0,0 +1,49 @@
+## New Feature
+
+Closes #
+
+<!-- Link to the issue or discussion where this feature was approved before starting work. PRs for features without a prior discussion may be closed without review. -->
+
+---
+
+## What This Does
+
+<!-- Describe the feature clearly. What does it enable that wasn't possible before? -->
+
+---
+
+## Why This Belongs Here
+
+<!-- Explain how this fits within the project's stated goals and philosophy. -->
+
+---
+
+## Implementation Notes
+
+<!-- Describe key design decisions, tradeoffs, or areas that need close review. -->
+
+---
+
+## How to Test
+
+1. 
+2. 
+3. 
+
+---
+
+## Screenshots / Demo
+
+<!-- Add screenshots, GIFs, or a short description of the visible output. Delete if not applicable. -->
+
+---
+
+## Checklist
+
+- [ ] This feature was discussed and approved in a linked issue or discussion before I started
+- [ ] I have read [CONTRIBUTING.md](../CONTRIBUTING.md)
+- [ ] The implementation matches what was discussed — or deviations are explained above
+- [ ] No new external runtime dependencies were added without prior approval
+- [ ] The build / bundle / file size impact has been considered (add numbers if relevant)
+- [ ] Documentation has been updated to reflect the new feature
+- [ ] I have tested manually across relevant environments