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/call-bound/index.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var callBindBasic = require('call-bind-apply-helpers');
+
+/** @type {(thisArg: string, searchString: string, position?: number) => number} */
+var $indexOf = callBindBasic([GetIntrinsic('%String.prototype.indexOf%')]);
+
+/** @type {import('.')} */
+module.exports = function callBoundIntrinsic(name, allowMissing) {
+	/* eslint no-extra-parens: 0 */
+
+	var intrinsic = /** @type {(this: unknown, ...args: unknown[]) => unknown} */ (GetIntrinsic(name, !!allowMissing));
+	if (typeof intrinsic === 'function' && $indexOf(name, '.prototype.') > -1) {
+		return callBindBasic(/** @type {const} */ ([intrinsic]));
+	}
+	return intrinsic;
+};