feat(auth): validate agent context upstream

src/routes/chatAuxiliaryRoutes.ts

@@ -1,6 +1,7 @@
 import { type Router } from "express";
 import { z } from "zod";
 
+import { getAgentAuthContext } from "../auth/agentAuth.js";
 import { type ChatSessionBridge } from "../chat/sessionBridge.js";
 import { logger } from "../logger.js";
 import { type ResultReferenceResolver } from "../results/resolver.js";
@@ -46,20 +47,14 @@ export const registerChatAuxiliaryRoutes = (
 ) => {
   chatRouter.get("/render-ref/:renderRef", async (req, res) => {
     const renderRef = req.params.renderRef?.trim();
-    const userId = req.header("x-user-id")?.trim();
-    const projectId = req.header("x-project-id") ?? undefined;
+    const authContext = getAgentAuthContext(req);
+    const userId = authContext.userId;
+    const projectId = authContext.projectId;
     const clientSessionId =
       typeof req.query.session_id === "string"
         ? req.query.session_id.trim()
         : undefined;
 
-    if (!userId) {
-      res.status(400).json({
-        message: "x-user-id is required",
-      });
-      return;
-    }
-
     if (!renderRef) {
       res.status(400).json({
         message: "render_ref is required",
@@ -98,8 +93,9 @@ export const registerChatAuxiliaryRoutes = (
     }
 
     try {
-      const projectId = req.header("x-project-id") ?? undefined;
-      const userId = req.header("x-user-id") ?? undefined;
+      const authContext = getAgentAuthContext(req);
+      const projectId = authContext.projectId;
+      const userId = authContext.userId;
       const actorKey = toActorKey(userId);
       const projectKey = toProjectKey(projectId);
       const sessionRecord = await sessionMetadataStore.get(