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The ReplServer was starting unconditionally on every MCP server instance, regardless of configuration. This exposed an unauthenticated POST /execute endpoint that forwarded arbitrary JavaScript to connected Penpot plugins. Gate ReplServer creation, startup, and shutdown behind isDevEnv(), consistent with how CljsReplTool and other dev tools are already protected. Log an info message when the REPL server is disabled. Consolidate the dev-env check into a single static isDevEnvEnabled() method that isDevEnv() delegates to, avoiding duplicate logic. Add PluginBridge.close() for proper WebSocket server cleanup on shutdown. Add regression tests that construct PenpotMcpServer and verify hasReplServer() returns the correct value based on the dev-env flag. AI-assisted-by: mimo-v2.5-pro