fix(webapp): forward the resolved S2 basin host to the task writer

Author: ericallam

apps/webapp/app/services/realtime/s2realtimeStreams.server.ts

@@ -193,7 +193,7 @@ export class S2RealtimeStreams implements StreamResponder, StreamIngestor {
         "X-S2-Basin": this.basin,
         "X-S2-Flush-Interval-Ms": this.flushIntervalMs.toString(),
         "X-S2-Max-Retries": this.maxRetries.toString(),
-        ...(this.endpoint ? { "X-S2-Endpoint": this.endpoint } : {}),
+        "X-S2-Endpoint": this.baseUrl,
       },
     };
   }

packages/trigger-sdk/src/v3/ai.ts

@@ -6068,7 +6068,9 @@ function chatAgent<
          * in-flight `.in` message dispatches it as the first turn. The recovery
          * block already advanced the `.in` cursor past the recovered message,
          * so the preload wait below would otherwise strand it (the run would
-         * sit waiting for a "first message" that already arrived).
+         * sit waiting for a "first message" that already arrived). `onPreload`
+         * is a one-time start-of-run hook and is deliberately not re-run on a
+         * recovered/continuation turn.
          */
         let dispatchedRecoveredFirstTurn = false;
         if (preloaded && bootInjectedQueue.length > 0) {