feat(channels): add google chat adapter and webhook route

src/gateway/server.ts

@@ -44,6 +44,7 @@ import type { RoutingPolicy } from '../routing/index.js';
 import type { ChannelRegistry } from '../channels/index.js';
 import { RequestBodyTooLargeError, readRequestBody } from '../utils/httpBody.js';
 import type { TeamsAdapter } from '../channels/teams/adapter.js';
+import type { GoogleChatAdapter } from '../channels/googleChat/adapter.js';
 
 export interface GatewayServerConfig {
   port: number;
@@ -96,6 +97,8 @@ export interface GatewayServerConfig {
   };
   /** Optional Teams adapter for inbound Bot Framework activity webhooks. */
   teamsHandler?: Pick<TeamsAdapter, 'handleRequest'>;
+  /** Optional Google Chat adapter for inbound Chat event webhooks. */
+  googleChatHandler?: Pick<GoogleChatAdapter, 'handleRequest'>;
 }
 
 export class GatewayServer {
@@ -485,6 +488,12 @@ export class GatewayServer {
       return;
     }
 
+    // Google Chat events route — bypass gateway auth (Google Chat posts directly)
+    if (this.config.googleChatHandler && req.method === 'POST' && req.url?.startsWith('/google-chat/events')) {
+      await this.config.googleChatHandler.handleRequest(req, res);
+      return;
+    }
+
     // Apply auth to HTTP requests when configured
     const authConfig = this.config.auth ?? {};
     if (this.config.authHttp !== false && authConfig.token) {
@@ -577,6 +586,11 @@ export class GatewayServer {
     this.config.teamsHandler = handler;
   }
 
+  /** Set the Google Chat handler for inbound event HTTP routes (late binding). */
+  setGoogleChatHandler(handler: Pick<GoogleChatAdapter, 'handleRequest'>): void {
+    this.config.googleChatHandler = handler;
+  }
+
   private async startDiscovery(host: string, port: number): Promise<void> {
     const discovery = this.config.discovery;
     if (!discovery?.enabled) {