chore: normalize CONTRIBUTING content

Author: George-iam

CONTRIBUTING.md

@@ -5,12 +5,12 @@ Thank you for your interest in contributing.
 ## Development Workflow
 
 1. Open an issue to discuss changes.
-2. Create a branch from .
+2. Create a branch from main.
 3. Add tests for all behavioral changes.
 4. Ensure CI passes before opening a PR.
 
 ## Pull Request Requirements
 
 - Clear summary and rationale
 - Test coverage for new behavior
-- Backward compatibility notes where applicable
+- Backward compatibility notes where applicable