style: add missing newlines at end of files

Add newlines at end of JSON example files and batch script
for consistent formatting.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/claude_config_macos.json

@@ -7,4 +7,4 @@
       }
     }
   }
-}
+}

examples/claude_config_windows.json

@@ -7,4 +7,4 @@
       }
     }
   }
-}
+}

examples/claude_config_wsl.json

@@ -8,4 +8,4 @@
       }
     }
   }
-}
+}

test_wsl_setup.bat

@@ -78,4 +78,4 @@ echo         "GEMINI_API_KEY": "your-key-here"
 echo       }
 echo     }
 echo   }
-echo }
+echo }