/.well-known/agent.json: what this site serves, for agents (SEO-2) (#41)

ddiff --git a/server/agent-descriptor.js b/server/agent-descriptor.js
nnew file mode 100644
iindex 0000000..8a408df
---- /dev/null
++++ b/server/agent-descriptor.js
@@@ -0,0 +1,15 @@
++'use strict';
++// What OpenVibe.Casino tells an agent about itself (openvibe-shared/agent-layer): /.well-known/agent.json (SEO-2).
++// Every field is something this site really serves; the purpose is its own llms.txt summary.
++module.exports = {
++    id: "casino",
++    name: "OpenVibe.Casino",
++    purpose: "Learn casino games, play them with chips worth nothing, and see exactly what each bet costs: open engines, exact house edges, simulations in the browser. Never real money.",
++    home: "https://openvibe.casino",
++    site: "openvibe.casino",
++    api: "/api/v1",
++    docs: "/developers",
++    policy: {
++        auth: ["none", "Network OIDC"],
++    },
++};
ddiff --git a/server/app.js b/server/app.js
iindex f5ca79a..9618e8a 100644
---- a/server/app.js
++++ b/server/app.js
@@@ -67,6 +67,8 @@ async function createApp(opts = {}) {
      };
  
      const app = express();
++    // /.well-known/agent.json (openvibe-shared/agent-layer, SEO-2): what this site serves, for agents.
++    require('openvibe-shared/agent-layer').mount(app, { descriptor: require('./agent-descriptor') });
      app.disable('x-powered-by');
      app.set('trust proxy', config.trustProxy);
      const release = require('openvibe-shared/release').createRelease({ service: 'casino', root: path.join(__dirname, '..') });
ddiff --git a/test/agent-json.test.js b/test/agent-json.test.js
nnew file mode 100644
iindex 0000000..4e30a18
---- /dev/null
++++ b/test/agent-json.test.js
@@@ -0,0 +1,19 @@
++'use strict';
++// SEO-2: /.well-known/agent.json answered 404 here (11-03 check of all 55 sites). The shared agent layer serves this
++// site's descriptor; every field is something it really serves.
++const assert = require('assert');
++const fs = require('fs');
++const path = require('path');
++const descriptor = require('../server/agent-descriptor');
++const { agentManifest } = require('openvibe-shared/agent-layer');
++
++const m = agentManifest(descriptor);
++assert.strictEqual(m.network, 'OpenVibe');
++assert.strictEqual(m.home, 'https://openvibe.casino');
++assert.ok(m.purpose && m.purpose.length > 40, 'a purpose');
++assert.ok(/^https:\/\//.test(m.api), 'its API, absolute');
++assert.strictEqual(m.llms, 'https://openvibe.casino/llms.txt');
++assert.ok(Array.isArray(m.policy.auth) && m.policy.auth.length, 'how it is called');
++const app = fs.readFileSync(path.join(__dirname, '..', 'server', 'app.js'), 'utf8');
++assert.match(app, /require\('openvibe-shared\/agent-layer'\)\.mount\(app, \{ descriptor: require\('\.\/agent-descriptor'\) \}\);/);
++console.log('agent.json: ok');