Fix operations CI and snapshots

backend/Controllers/OperationsController.cs

@@ -1,3 +1,4 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Nexus.Api.Services;
 
@@ -8,6 +9,7 @@ namespace Nexus.Api.Controllers;
 public class OperationsController(IOperationsService operationsService) : ControllerBase
 {
     [HttpGet("snapshot")]
+    [Authorize]
     public async Task<IResult> GetSnapshot(CancellationToken ct)
         => Results.Ok(await operationsService.GetSnapshotAsync(ct));
 }

backend/Services/OperationsService.cs

@@ -15,16 +15,13 @@ public sealed class OperationsService(
     {
         var runtimeTask = runtime.GetStatusAsync(ct);
         var agentsTask = agentService.GetAgentsAsync(ct);
-        var projectsTask = projectRepo.GetAllAsync(ct);
-        var tasksTask = taskRepo.GetAllAsync(ct);
-        var activityTask = activityRepo.GetRecentAsync(20, ct);
-        await Task.WhenAll(runtimeTask, agentsTask, projectsTask, tasksTask, activityTask);
-
-        var tasks = tasksTask.Result;
-        var projects = projectsTask.Result;
-        var agents = agentsTask.Result;
+        // Repository calls share the scoped EF Core DbContext and must stay serialized.
+        var projects = await projectRepo.GetAllAsync(ct);
+        var tasks = await taskRepo.GetAllAsync(ct);
+        var activity = await activityRepo.GetRecentAsync(20, ct);
+        var agents = await agentsTask;
         var completedTasks = tasks.Count(x => x.State == TaskStateHelper.ToStateString(TaskState.Done));
-        var runtimeStatus = runtimeTask.Result;
+        var runtimeStatus = await runtimeTask;
 
         var lastIncident = tasks
             .Where(x => x.State == TaskStateHelper.ToStateString(TaskState.Blocked))
@@ -56,7 +53,7 @@ public sealed class OperationsService(
             agents = agents.Select(x => new { x.Id, x.Name, x.Role, x.Status, x.Model }),
             projects = projects.Select(x => new { x.Id, x.Name, x.Status, x.Progress, x.UpdatedAt }),
             tasks = tasks.Select(x => new { x.Id, x.Title, x.State, x.Priority, x.ProjectId, x.UpdatedAt }),
-            activity = activityTask.Result.Select(x => new { x.Id, x.Type, x.Message, at = x.CreatedAt })
+            activity = activity.Select(x => new { x.Id, x.Type, x.Message, at = x.CreatedAt })
         };
     }
 }