Update .gitignore to exclude Go binaries and remove registry from tracking

Author: domdomegg

.gitignore

@@ -1,12 +1,34 @@
+# Go binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+/registry
+/publisher
+/tools/publisher/publisher
+
+# Go build cache
 build/*
+**/bin
+
+# Environment and config
 .db
 .env
 .mcpregistry*
-**/bin
-cmd/registry/registry
+
+# OS files
 .DS_Store
+
+# Test binaries
 validate-examples
 validate-schemas
+
+# IDE
 .idea/
+
+# Test coverage
 coverage.out
 coverage.html