feat(chat): cut over to single SSE endpoint

src/test/java/com/superbiz/agent/controller/FrontendChatSseContractTest.java

@@ -0,0 +1,36 @@
+package com.superbiz.agent.controller;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class FrontendChatSseContractTest {
+
+    private static final Path STATIC_ROOT = Path.of("src", "main", "resources", "static");
+
+    @Test
+    void bundledChatUsesOnlyTheNewSseConsumer() throws IOException {
+        String app = Files.readString(STATIC_ROOT.resolve("app.js"), StandardCharsets.UTF_8);
+        String html = Files.readString(STATIC_ROOT.resolve("index.html"), StandardCharsets.UTF_8);
+
+        assertTrue(app.contains("sendChatMessage"));
+        assertTrue(app.contains("/chat`"));
+        assertTrue(app.contains("case 'metadata'"));
+        assertTrue(app.contains("case 'status'"));
+        assertTrue(app.contains("case 'content'"));
+        assertTrue(app.contains("case 'failure'"));
+        assertTrue(app.contains("case 'done'"));
+        assertFalse(app.contains("/chat_stream"));
+        assertFalse(app.contains("sendQuickMessage"));
+        assertFalse(app.contains("sendStreamMessage"));
+        assertFalse(app.contains("currentMode"));
+        assertFalse(html.contains("modeSelectorBtn"));
+        assertFalse(html.contains("modeDropdown"));
+    }
+}