feat: add robust MCP file configuration writer

Adds FileWriter class that 'intelligently' handles plain JSON files, and JSON5 style files which VS Code supports.

- Detects & preserves JSON 5 features (comments, trailing commas)
- 'Smart' injects based on existing keys and indents

Author: ashleyhindle

src/Install/CodeEnvironment/CodeEnvironment.php

@@ -12,6 +12,7 @@
 use Laravel\Boost\Install\Detection\DetectionStrategyFactory;
 use Laravel\Boost\Install\Enums\McpInstallationStrategy;
 use Laravel\Boost\Install\Enums\Platform;
+use Laravel\Boost\Install\Mcp\FileWriter;
 
 abstract class CodeEnvironment
 {
@@ -186,21 +187,9 @@ protected function installFileMcp(string $key, string $command, array $args = []
             return false;
         }
 
-        File::ensureDirectoryExists(dirname($path));
-
-        $config = File::exists($path)
-            ? json_decode(File::get($path), true) ?: []
-            : [];
-
-        $mcpKey = $this->mcpConfigKey();
-        data_set($config, "{$mcpKey}.{$key}", collect([
-            'command' => $command,
-            'args' => $args,
-            'env' => $env,
-        ])->filter()->toArray());
-
-        $json = json_encode($config, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
-
-        return $json && File::put($path, $json);
+        return (new FileWriter($path))
+            ->configKey($this->mcpConfigKey())
+            ->addServer($key, $command, $args, $env)
+            ->save();
     }
 }