fix: Add bin/code-review-guardian.sh and .gitattributes to package

- Add bin/code-review-guardian.sh to git (required for package distribution)
- Add .gitattributes to exclude development files from package
- Ensures script is included in Composer package

Author: HecFranco

.gitattributes

@@ -1,9 +1,11 @@
-* text=auto
-*.php text eol=lf
-*.json text eol=lf
-*.xml text eol=lf
-*.yml text eol=lf
-*.yaml text eol=lf
-*.md text eol=lf
-*.sh text eol=lf
-
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.github export-ignore
+/docs export-ignore
+/tests export-ignore
+/phpunit.xml.dist export-ignore
+/.editorconfig export-ignore
+/.dockerignore export-ignore
+/docker-compose.yml export-ignore
+/Dockerfile export-ignore
+/Makefile export-ignore