chore: cleanup and maintenance

- Remove .node-version file and add to .gitignore
- Update .gitignore patterns
- Repository cleanup and code organization

Author: jdalton

.gitignore

@@ -10,12 +10,14 @@ desktop.ini
 /.env
 /.env.local
 /.env.*.local
-/.pnpmfile.cjs
+/.node-version
 /.nvm
+/.pnpmfile.cjs
 
 # Build artifacts
 /.type-coverage
 /coverage
+/coverage-isolated
 **/dist
 **/*.tsbuildinfo
 *.d.ts