docs: establish PicadoLabs open-source governance, CI workflows, and contributor guidelines

.github/pull_request_template.md

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+## Summary
+Provide a brief summary of the changes introduced in this pull request.
+
+## Motivation
+Explain why this change is necessary and what issue it resolves.
+
+## Changes Made
+- List key changes and additions.
+- Reference modified files and modules.
+
+## Testing Performed
+- [ ] Backend tests passing (`pytest backend/tests`)
+- [ ] Frontend build passing (`cd frontend && npm run build`)
+- [ ] Manual verification in Control Room or Typer CLI
+
+## Breaking Changes
+- [ ] Yes (explain below)
+- [ ] No
+
+## Checklist
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have added tests that prove my fix or feature works
+- [ ] I have updated the documentation accordingly