Function createA2AAdapter

Example

const adcp = createAdcpServer({ mediaBuy: { getProducts: async () => ({ products: [] }) } });
const a2a = createA2AAdapter({
  server: adcp,
  agentCard: {
    name: 'Acme SSP',
    description: 'Guaranteed + non-guaranteed display inventory',
    url: 'https://ssp.acme.com/a2a',
    version: '1.0.0',
    provider: { organization: 'Acme', url: 'https://acme.com' },
    securitySchemes: { bearer: { type: 'http', scheme: 'bearer' } },
  },
  async authenticate(req) {
    const token = extractBearer(req);
    return token ? { token, clientId: 'buyer_123', scopes: [] } : null;
  },
});

app.use('/a2a', a2a.jsonRpcHandler);
app.use('/.well-known/agent-card.json', a2a.agentCardHandler);
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