docs: add Write Tests and Run Validation critical rules

Author: CalvinAllen

CLAUDE.md

@@ -19,9 +19,11 @@ code in this repository.
 7. **Check branch status before pushing** - Verify the remote tracking branch
    still exists. If a PR was merged/deleted, create a new branch from main
    instead
-8. **No co-authors** - Do not add co-author information on commits or pull
+8. **Write tests** - All new/refactored code requires tests
+9. **Run validation before commits** - Run `npm run all` (format, lint, test, package) before committing
+10. **No co-authors** - Do not add co-author information on commits or pull
    requests
-9. **No "generated by" statements** - Do not add generated-by statements on pull
+11. **No "generated by" statements** - Do not add generated-by statements on pull
    requests
 
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