Modo desarrollo para agregar-tool/quitar-tool, eliminar define-mcp-tool

- agregar-tool y quitar-tool solo disponibles con --dev o WEBMCP_DEV=true
- Eliminar built-in define-mcp-tool (sin utilidad en este fork)
- Advertencia [DEV] en logs al iniciar en modo desarrollo
- Documentar modo dev, parametros y flujos en README

src/websocket-server.js

@@ -1585,6 +1585,7 @@ const parseArgs = async () => {
     let cleanTokens = false;
     let encodedPair = null;
     let daemon = true; // Default to daemonize
+    let dev = process.env.WEBMCP_DEV === 'true' || process.env.WEBMCP_DEV === '1';
 
     for (let i = 0; i < args.length; i++) {
         const arg = args[i];
@@ -1629,6 +1630,8 @@ const parseArgs = async () => {
             cleanTokens = true;
         } else if (arg === '-f' || arg === '--foreground') {
             daemon = false;
+        } else if (arg === '--dev') {
+            dev = true;
         } else if (arg === '--forked') {
             // This is an internal flag to indicate we're the forked child                                                                                                   │ │
             // No need to do anything with it here, just don't error on it
@@ -1639,7 +1642,7 @@ const parseArgs = async () => {
         }
     }
 
-    return {port, quit, newToken, cleanTokens, encodedPair, daemon, startMCP};
+    return {port, quit, newToken, cleanTokens, encodedPair, daemon, startMCP, dev};
 };
 
 const showHelp = () => {
@@ -1656,7 +1659,8 @@ Options:
   -f, --foreground               Run in foreground (don't daemonize)
   -m, --mcp                      Internal WebMCP Server codepath, likely only used in MCP client config
   -d, --docker                   Tell the MCP client that WebMCP is running in docker
-  
+  --dev                          Enable development mode (agregar-tool, quitar-tool)
+
 Use --new to generate a token which clients can use to register on the /register endpoint.
 Use --clean to remove all authorized tokens when you want to start fresh.
   `);
@@ -1756,10 +1760,12 @@ const main = async () => {
     // Start the server
     const PORT = CONFIG.port;
     httpServer.listen(PORT, () => {
-        console.error(`WebSocket server running at http://${HOST}:${PORT}`);
         console.error(`WebSocket server running at http://${HOST}:${PORT}`);
         console.error(`WebMCP client token (for MCP path): ${serverToken}`);
         console.error(`WebMCP client URL: ws://${HOST}:${PORT}${MCP_PATH}?token=${serverToken}`);
+        if (CONFIG.dev) {
+            console.error(`[DEV] Modo desarrollo activo — agregar-tool y quitar-tool habilitados`);
+        }
         console.error(`Use 'node websocket-server.js --new <encoded-pair>' to authorize a channel-token pair`);
     });