feat(API-11): Route API calls through AgilitonAPI gateway

Add gateway-first pattern: when AGILITON_API_KEY is set, route all
external API calls through the gateway with X-API-Key auth. Falls back
to direct API access when gateway is unavailable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/@modelcontextprotocol/sdk/dist/cjs/client/websocket.d.ts

@@ -0,0 +1,17 @@
+import { Transport } from '../shared/transport.js';
+import { JSONRPCMessage } from '../types.js';
+/**
+ * Client transport for WebSocket: this will connect to a server over the WebSocket protocol.
+ */
+export declare class WebSocketClientTransport implements Transport {
+    private _socket?;
+    private _url;
+    onclose?: () => void;
+    onerror?: (error: Error) => void;
+    onmessage?: (message: JSONRPCMessage) => void;
+    constructor(url: URL);
+    start(): Promise<void>;
+    close(): Promise<void>;
+    send(message: JSONRPCMessage): Promise<void>;
+}
+//# sourceMappingURL=websocket.d.ts.map