agent.json names /openapi.json, which this site now serves (#75)

ddiff --git a/server/agent-descriptor.js b/server/agent-descriptor.js
iindex 296d53e..899f057 100644
---- a/server/agent-descriptor.js
++++ b/server/agent-descriptor.js
@@@ -2,6 +2,7 @@
  // What openvibe.domains tells an agent about itself (openvibe-shared/agent-layer): /.well-known/agent.json.
  // Every field is something this site really serves: the open JSON API under /api/v1 and the developers page that
  // documents it. No OpenAPI document or MCP endpoint is published.
++// 11-03 (SEO-3): this site serves /openapi.json now (the contracts' document for it), so it is named below.
  module.exports = {
      id: 'domains',
      name: 'OpenVibe.Domains',
@@@ -10,6 +11,7 @@ module.exports = {
      site: 'openvibe.domains',
      api: '/api/v1',
      docs: '/developers',
++    openapi: '/openapi.json',
      policy: {
          auth: ['none', 'Network OIDC'],
          rateLimit: '120 API and name-query requests a minute per address; pages are not rate limited',
ddiff --git a/test/agent-layer.test.js b/test/agent-layer.test.js
iindex 21285b9..fbb08f9 100644
---- a/test/agent-layer.test.js
++++ b/test/agent-layer.test.js
@@@ -38,7 +38,7 @@ const tools = {
              assert.strictEqual(m.api, 'https://openvibe.domains/api/v1');
              assert.strictEqual(m.docs, 'https://openvibe.domains/developers');
              assert.deepStrictEqual(m.policy.auth, ['none', 'Network OIDC']);
--            assert.strictEqual(m.openapi, undefined);
++            assert.strictEqual(m.openapi, 'https://openvibe.domains/openapi.json', 'the contracts\' document, served since 11-03 (SEO-3)');
              assert.strictEqual(m.mcp, undefined);
          });