feat(msteams): add outbound sends and fix reply delivery

- Add sendMessageMSTeams for proactive messaging via CLI/gateway
- Wire msteams into outbound delivery, heartbeat targets, and gateway send
- Fix reply delivery to use SDK's getConversationReference() for proper
  bot info, avoiding "Activity Recipient undefined" errors
- Use proactive messaging for replies to post as top-level messages
  (not threaded) by omitting activityId from conversation reference
- Add lazy logger in send.ts to avoid test initialization issues

src/gateway/server.ts

@@ -1964,6 +1964,13 @@ export async function startGatewayServer(
             startIMessageProvider,
           );
         }
+        if (plan.restartProviders.has("msteams")) {
+          await restartProvider(
+            "msteams",
+            stopMSTeamsProvider,
+            startMSTeamsProvider,
+          );
+        }
       }
     }