Add security and git policies, make repo a model example

- Never commit secrets; comprehensive .gitignore with fetch URL
- Never force-push to main
- go mod tidy before committing
- make hooks target with Go repo detection
- Add .editorconfig, .prettierrc, .prettierignore
- Template files URL for new repo setup

.prettierrc

@@ -0,0 +1,3 @@
+{
+    "tabWidth": 4
+}