fix(agent): complete opencode warmup before serving

The previous fire-and-forget startup only created the SDK client, leaving the first chat to await project and tool initialization. Warm the real session/tool path and gate port listening on completion.

src/server.ts

@@ -488,23 +488,12 @@ const bootstrap = async () => {
     resultReferenceStore.initialize(),
     sessionTranscriptStore.initialize(),
   ]);
-  resultReferenceStore.startCleanupLoop();
 };
 
-await bootstrap();
-
-const server = app.listen(config.PORT, config.HOST, () => {
-  logger.info(
-    { host: config.HOST, port: config.PORT },
-    "TJWaterAgent listening",
-  );
-  void warmupOpencodeRuntime();
-});
-
 const warmupOpencodeRuntime = async () => {
   const startedAt = Date.now();
   try {
-    await opencodeRuntime.ensureClient();
+    await opencodeRuntime.warmup();
     logger.info(
       {
         elapsedMs: Math.max(0, Date.now() - startedAt),
@@ -521,9 +510,21 @@ const warmupOpencodeRuntime = async () => {
       },
       "failed to warm up opencode runtime",
     );
+    throw error;
   }
 };
 
+await bootstrap();
+await warmupOpencodeRuntime();
+resultReferenceStore.startCleanupLoop();
+
+const server = app.listen(config.PORT, config.HOST, () => {
+  logger.info(
+    { host: config.HOST, port: config.PORT },
+    "TJWaterAgent listening",
+  );
+});
+
 const shutdown = async () => {
   logger.info("shutting down TJWaterAgent");
   server.close();