fix: unblock agent events after portal direct chat escalation

When a session starts with LLM direct chat then escalates to goosed,
invalidate the portal-direct-chat snapshot and stop replaying stale SSE
so page-generation turns stream and finish correctly.

Co-authored-by: Cursor <cursoragent@cursor.com>

agent-run-gateway.test.mjs

@@ -383,6 +383,63 @@ test('agent run uses direct chat on regular agent sessions when llm routes direc
   assert.ok(pool.events.some((event) => event.eventType === 'direct_chat_completed'));
 });
 
+test('agent run invalidates portal direct chat snapshot before submitting to goosed', async () => {
+  const pool = createFakePool();
+  const submitted = [];
+  const invalidated = [];
+  const gateway = createAgentRunGateway({
+    pool,
+    userAuth: {
+      async getUserCapabilities() {
+        return { grantedSkills: ['static-page-publish'] };
+      },
+    },
+    tkmindProxy: {
+      async submitSessionReplyForUser(userId, sessionId, requestId, userMessage) {
+        submitted.push({ userId, sessionId, requestId, userMessage });
+      },
+    },
+    chatIntentRouter: {
+      isEnabled() {
+        return true;
+      },
+      async classify() {
+        return {
+          route: 'agent_orchestration',
+          confidence: 1,
+          reason: '用户开启深度推理',
+          source: 'rule',
+        };
+      },
+      applyAgentOrchestration(userMessage) {
+        return userMessage;
+      },
+    },
+    sessionSnapshotService: {
+      async remove(sessionId) {
+        invalidated.push(sessionId);
+      },
+    },
+    retryDelaysMs: [],
+  });
+
+  const run = await gateway.createRun('user-1', {
+    sessionId: '20260704_31',
+    requestId: 'req-essay-page',
+    forceDeepReasoning: true,
+    userMessage: {
+      role: 'user',
+      content: [{ type: 'text', text: '帮我写一个 200 字散文，做成页面' }],
+      metadata: { displayText: '帮我写一个 200 字散文，做成页面' },
+    },
+  });
+
+  await waitFor(() => pool.runs.get(run.id)?.status === 'succeeded');
+  assert.deepEqual(invalidated, ['20260704_31']);
+  assert.equal(submitted.length, 1);
+  assert.equal(submitted[0].sessionId, '20260704_31');
+});
+
 test('agent run records direct_chat_skipped when execution is unavailable', async () => {
   const pool = createFakePool();
   const submitted = [];