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.mjs

@@ -224,6 +224,7 @@ export function createAgentRunGateway({
   toolGateway = null,
   directChatService = null,
   chatIntentRouter = null,
+  sessionSnapshotService = null,
   retryDelaysMs = DEFAULT_RUN_RETRY_DELAYS_MS,
   autoDispatch = envFlag(process.env.MEMIND_AGENT_RUN_AUTODISPATCH, true),
   maxConcurrentRuns = positiveInteger(
@@ -409,6 +410,11 @@ export function createAgentRunGateway({
     return Array.isArray(caps?.grantedSkills) ? caps.grantedSkills : [];
   }
 
+  async function invalidatePortalDirectChatSnapshot(sessionId) {
+    if (!sessionId || isDirectChatSessionId(sessionId) || !sessionSnapshotService?.remove) return;
+    await sessionSnapshotService.remove(sessionId).catch(() => {});
+  }
+
   async function resolveRunRouting(row, userMessage, runOptions) {
     if (!chatIntentRouter?.classify) return null;
     const enabled = chatIntentRouter.isEnabled
@@ -497,6 +503,7 @@ export function createAgentRunGateway({
       const workingDir = userAuth?.resolveWorkingDir
         ? await userAuth.resolveWorkingDir(row.user_id)
         : undefined;
+      await invalidatePortalDirectChatSnapshot(row.agent_session_id ?? null);
       await appendEvent(runId, 'tool_gateway_dispatch', {
         protocol: toolGatewayStatus.protocol ?? 'agent-run-v1',
         taskType: runOptions.taskType,
@@ -563,6 +570,7 @@ export function createAgentRunGateway({
       });
     }
 
+    await invalidatePortalDirectChatSnapshot(sessionId);
     await tkmindProxy.submitSessionReplyForUser(
       row.user_id,
       sessionId,