feat(api): expose REST-only agent routes

src/auth/agentAuth.ts

@@ -100,7 +100,7 @@ export const requireAgentAuth = async (
   const timer = setTimeout(() => controller.abort(), config.AGENT_AUTH_TIMEOUT_MS);
 
   try {
-    const response = await fetch(new URL("/api/v1/agent/auth/context", config.TJWATER_API_BASE_URL), {
+    const response = await fetch(new URL("/api/v1/agent-auth-context", config.TJWATER_API_BASE_URL), {
       method: "GET",
       headers: {
         Accept: "application/json",
@@ -125,18 +125,27 @@ export const requireAgentAuth = async (
       return;
     }
 
-    const detail = await response.text();
-    res.status(response.status === 403 ? 403 : 401).json({
-      message: response.status === 403 ? "forbidden" : "unauthorized",
-      detail: detail || undefined,
-    });
+    const status =
+      response.status === 400 ||
+      response.status === 401 ||
+      response.status === 403 ||
+      response.status === 404
+        ? response.status
+        : response.status === 503
+          ? 503
+          : 502;
+    const messages: Record<number, string> = {
+      400: "invalid authentication request",
+      401: "unauthorized",
+      403: "forbidden",
+      404: "authentication context not found",
+      502: "invalid authentication service response",
+      503: "authentication service unavailable",
+    };
+    res.status(status).json({ message: messages[status] });
   } catch (error) {
-    const detail = error instanceof Error ? error.message : String(error);
     logger.warn({ err: error }, "agent auth validation failed");
-    res.status(503).json({
-      message: "authentication service unavailable",
-      detail,
-    });
+    res.status(503).json({ message: "authentication service unavailable" });
   } finally {
     clearTimeout(timer);
   }