feat: board-first orchestration with Gateway Bridge, live-update, and flow-board

- GatewayBridgeController: MCP-artiger Kommando-Adapter für Agent-zu-Backend
- TaskBridgeService + LiveUpdateService: SSE Live-Sync + Bridge-Kommandos
- FlowBoard.vue: Board-first orchestration dashboard panel
- live-sync.ts store + live.ts service: SSE-basierte Live-Updates
- Nullability-Warnung in HealthController.cs gefixt
- nginx.conf: SSE-Proxy + CORS für Bridge-Endpunkte
- .gitignore: pnpm/corepack local caches ausgeschlossen
- docs: architecture-board-first-orchestration.md hinzugefügt
- README: Backend Bridge API dokumentiert

.gitignore

@@ -34,7 +34,9 @@ docker-compose.override.yml
 **/core
 **/core.*
 
-# pnpm (lockfile IS committed for reproducible CI builds)
+# pnpm / corepack local caches (lockfile IS committed for reproducible CI builds)
+frontend/.pnpm-home/
+frontend/.corepack-home/
 
 # Claude local config (per-developer, not repo-shared)
 .claude/

README.md

@@ -3,6 +3,10 @@
 Nexus is the operations platform for the Noveria ecosystem. OpenClaw is an
 adapter-backed agent runtime, not a dependency of the frontend or domain model.
 
+> 📋 **Architektur-Review** (2026-06-22): Board-first Orchestrierung, sichere
+> Backend-Brücke und Gateway-Integration geprüft. Siehe
+> [`docs/architecture-board-first-orchestration.md`](docs/architecture-board-first-orchestration.md)
+
 > CI runs automatically on every push. CD can run **automatically after successful CI**
 > on main (patch-bump default) or can be triggered **manually** (workflow_dispatch) with
 > full parameter control. Main deploys bump/tag a release; arbitrary `git_ref` deploys
@@ -170,6 +174,38 @@ Legacy ModuleView routes (not standalone, rendered through `ModuleView.vue`):
 
 ## API endpoints
 
+### Backend Bridge (Agent-zu-Backend, NICHT Frontend)
+
+Der `/api/bridge/` Pfad ist ein strukturierter MCP-artiger Kommando-Adapter für die
+Agent-zu-Backend-Kommunikation. Kein Frontend-Code ruft diese Endpunkte auf.
+
+Auth: `X-Agent-Id` Header, `X-Nexus-Api-Key`, oder JWT. Rate-Limited (30/min).
+
+| Methode | Pfad | Kommando | Beschreibung |
+|---|---|---|---|
+| `GET` | `/api/bridge/health` | — | Bridge-Health-Check |
+| `POST` | `/api/bridge/tasks` | `create_task` | Neue Top-Level-Task erstellen |
+| `POST` | `/api/bridge/tasks/{id}/children` | `create_child_task` | Child-Task unter Parent erstellen |
+| `PATCH` | `/api/bridge/tasks/{id}/status` | `update_status` | Task-Status ändern |
+| `POST` | `/api/bridge/tasks/{id}/activity` | `append_activity` | Aktivitätseintrag anhängen |
+| `POST` | `/api/bridge/tasks/{id}/handoff` | `handoff` | Task an anderen Agent übergeben |
+| `GET` | `/api/bridge/board` | `get_board` | Vollständiges Task-Board |
+| `GET` | `/api/bridge/tasks/{id}` | `get_task` | Einzelne Task abrufen |
+| `GET` | `/api/bridge/tasks/{id}/children` | `get_children` | Child-Tasks abrufen |
+| `GET` | `/api/bridge/tasks/{id}/activity` | `get_activity` | Task-Aktivität abrufen |
+| `GET` | `/api/bridge/agent-overview` | `get_agent_overview` | Agent-Workflow-Übersicht |
+
+Response-Format (TaskBridgeCommandResponse<T>):
+```json
+{
+  "ok": true,
+  "command": "create_task",
+  "data": { ... },
+  "error": null,
+  "timestamp": "2026-06-22T15:30:00.000Z"
+}
+```
+
 ### Health & Auth (public or rate-limited)
 
 | Method | Path | Auth | Description |

backend-tests/Nexus.Api.Tests.csproj

@@ -9,6 +9,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.8" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.8" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.0">

backend-tests/OperationsSnapshotTests.cs

@@ -143,4 +143,7 @@ internal sealed class SnapshotAgentServiceStub : IAgentService
 
     public Task<AgentDetail?> GetAgentAsync(string id, CancellationToken cancellationToken)
         => throw new NotSupportedException();
+
+    public Task<IReadOnlySet<string>> GetAllowedAgentIdsAsync(CancellationToken cancellationToken)
+        => Task.FromResult<IReadOnlySet<string>>(new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "iris" });
 }

backend/Controllers/DashboardController.cs

@@ -15,7 +15,9 @@ public class DashboardController(
     IDashboardService dashboardService,
     ITaskService taskService,
     IActivityRepository activityService,
-    IHttpContextAccessor httpContextAccessor) : ControllerBase
+    IHttpContextAccessor httpContextAccessor,
+    INotificationService notificationService,
+    ILiveUpdateService liveUpdateService) : ControllerBase
 {
     [HttpGet("status")]
     public async Task<DashboardStatus> GetStatus()
@@ -193,6 +195,69 @@ public class DashboardController(
     public async Task<BoardResponse> GetBoard(CancellationToken ct)
         => await taskService.GetBoardAsync(ct);
 
+    [HttpGet("live")]
+    public async Task Live(
+        [FromQuery] string forUser = "bao",
+        [FromQuery] int notificationLimit = 50,
+        [FromQuery] long? afterSequence = null,
+        CancellationToken ct = default)
+    {
+        Response.Headers.Append("Content-Type", "text/event-stream");
+        Response.Headers.Append("Cache-Control", "no-cache, no-store, must-revalidate");
+        Response.Headers.Append("Connection", "keep-alive");
+        Response.Headers.Append("X-Accel-Buffering", "no");
+
+        async Task WriteEventAsync(string eventName, object payload)
+        {
+            await Response.WriteAsync($"event: {eventName}\n", ct);
+            await Response.WriteAsync($"data: {System.Text.Json.JsonSerializer.Serialize(payload)}\n\n", ct);
+            await Response.Body.FlushAsync(ct);
+        }
+
+        var currentSequence = liveUpdateService.CurrentSequence;
+        var initial = new DashboardLiveSnapshotDto(
+            await taskService.GetBoardAsync(ct),
+            await notificationService.GetSnapshotAsync(forUser, notificationLimit, ct: ct),
+            new LiveCursorDto(currentSequence, DateTimeOffset.UtcNow, "live"));
+        await WriteEventAsync("snapshot", initial);
+
+        var subscription = await liveUpdateService.SubscribeAsync(afterSequence, ct);
+        using var heartbeat = new PeriodicTimer(TimeSpan.FromSeconds(20));
+
+        while (!ct.IsCancellationRequested)
+        {
+            var readTask = subscription.Reader.ReadAsync(ct).AsTask();
+            var heartbeatTask = heartbeat.WaitForNextTickAsync(ct).AsTask();
+            var completed = await Task.WhenAny(readTask, heartbeatTask);
+
+            if (completed == readTask)
+            {
+                var envelope = await readTask;
+                if (envelope.Type == "notifications.snapshot")
+                {
+                    var snapshot = envelope.Payload as NotificationSnapshotDto
+                        ?? await notificationService.GetSnapshotAsync(forUser, notificationLimit, ct: ct);
+                    if (!string.Equals(snapshot.ForUser, forUser, StringComparison.OrdinalIgnoreCase))
+                        continue;
+                    envelope = envelope with { Payload = snapshot };
+                }
+
+                if (envelope.Type == "tasks.board.snapshot")
+                {
+                    envelope = envelope with { Payload = await taskService.GetBoardAsync(ct) };
+                }
+
+                await WriteEventAsync("update", new DashboardLiveEventDto(
+                    envelope,
+                    new LiveCursorDto(envelope.Sequence, envelope.Timestamp, "live")));
+            }
+            else if (await heartbeatTask)
+            {
+                await WriteEventAsync("heartbeat", new LiveCursorDto(liveUpdateService.CurrentSequence, DateTimeOffset.UtcNow, "live"));
+            }
+        }
+    }
+
     [HttpPatch("tasks/{id:guid}/move")]
     public async Task<ActionResult<DashboardTaskDto>> MoveTask(
         Guid id, [FromBody] MoveTaskRequest request, CancellationToken ct)

backend/Controllers/GatewayBridgeController.cs

@@ -0,0 +1,368 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.RateLimiting;
+using Nexus.Api.DTOs;
+using Nexus.Api.Models;
+using Nexus.Api.Services;
+
+namespace Nexus.Api.Controllers;
+
+/// <summary>
+/// MCP-style (structured-command) backend bridge for agent-facing operations.
+///
+/// This is the SINGLE entrypoint for agents (Iris + sub-agents) to interact with
+/// the Nexus task board, activity log, and delegation workflow.
+///
+/// AUTHENTICATION: Requires X-Nexus-Api-Key or a known allowed X-Agent-Id.
+/// The browser NEVER uses this controller — only backend-to-backend and gateway-to-backend.
+///
+/// DESIGN PRINCIPLE: No MCP protocol between Nexus and Gateway — instead, the Gateway
+/// calls these structured HTTP endpoints (same pattern, simpler transport).
+///
+/// COMMANDS:
+///   create_task       → POST /api/bridge/tasks
+///   create_child_task → POST /api/bridge/tasks/{id}/children
+///   update_status     → PATCH /api/bridge/tasks/{id}/status
+///   append_activity   → POST /api/bridge/tasks/{id}/activity
+///   handoff           → POST /api/bridge/tasks/{id}/handoff
+///   get_board         → GET  /api/bridge/board
+///   get_task          → GET  /api/bridge/tasks/{id}
+///   get_children      → GET  /api/bridge/tasks/{id}/children
+///   get_activity      → GET  /api/bridge/tasks/{id}/activity
+///   get_agent_overview → GET /api/bridge/agent-overview
+/// </summary>
+[ApiController]
+[Route("api/bridge")]
+[EnableRateLimiting("agents")]
+public class GatewayBridgeController(
+    ITaskBridgeService bridge,
+    IAgentService agentService,
+    ILogger<GatewayBridgeController> logger) : ControllerBase
+{
+    private const string ApikeyErrorMessage =
+        "Bridge endpoints require X-Nexus-Api-Key or X-Agent-Id header with a recognized agent identity.";
+
+    [HttpGet("health")]
+    public IResult Health()
+    {
+        return Results.Ok(new
+        {
+            status = "ok",
+            service = "nexus-bridge",
+            version = "1.0.0",
+            commands = new[]
+            {
+                "create_task", "create_child_task", "update_status",
+                "append_activity", "handoff", "get_board", "get_task",
+                "get_children", "get_activity", "get_agent_overview"
+            }
+        });
+    }
+
+    [HttpPost("tasks")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<DashboardTaskDto>>> CreateTask(
+        [FromBody] BridgeCreateTaskCommand command,
+        CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var agentId = resolution.AgentId;
+        var result = await bridge.CreateTaskAsync(
+            title: command.Title,
+            detail: command.Detail,
+            source: ResolveSource(agentId),
+            priority: command.Priority ?? "Normal",
+            assignedTo: command.AssignedTo ?? agentId,
+            projectId: command.ProjectId,
+            ct: ct);
+
+        return MapResult(result, "create_task");
+    }
+
+    [HttpPost("tasks/{parentTaskId:guid}/children")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<DashboardTaskDto>>> CreateChildTask(
+        Guid parentTaskId,
+        [FromBody] BridgeCreateChildTaskCommand command,
+        CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var agentId = resolution.AgentId;
+        var result = await bridge.CreateChildTaskAsync(
+            parentTaskId: parentTaskId,
+            title: command.Title,
+            detail: command.Detail,
+            source: ResolveSource(agentId),
+            priority: command.Priority ?? "Normal",
+            assignedTo: command.AssignedTo,
+            expectedFrom: command.ExpectedFrom ?? command.AssignedTo,
+            ct: ct);
+
+        return MapResult(result, "create_child_task");
+    }
+
+    [HttpPatch("tasks/{taskId:guid}/status")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<DashboardTaskDto>>> UpdateStatus(
+        Guid taskId,
+        [FromBody] BridgeUpdateStatusCommand command,
+        CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var agentId = resolution.AgentId;
+        var result = await bridge.UpdateStatusAsync(
+            taskId: taskId,
+            state: command.State,
+            callerAgent: agentId,
+            ct: ct);
+
+        return MapResult(result, "update_status");
+    }
+
+    [HttpPost("tasks/{taskId:guid}/activity")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<ActivityEntryDto>>> AppendActivity(
+        Guid taskId,
+        [FromBody] BridgeAppendActivityCommand command,
+        CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var result = await bridge.AppendActivityAsync(
+            taskId: taskId,
+            message: command.Message,
+            type: command.Type ?? "comment",
+            ct: ct);
+
+        return MapActivityResult(result, "append_activity");
+    }
+
+    [HttpPost("tasks/{taskId:guid}/handoff")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<DashboardTaskDto>>> Handoff(
+        Guid taskId,
+        [FromBody] BridgeHandoffCommand command,
+        CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var result = await bridge.HandoffAsync(
+            taskId: taskId,
+            targetAgent: command.TargetAgent,
+            note: command.Note,
+            ct: ct);
+
+        return MapResult(result, "handoff");
+    }
+
+    [HttpGet("board")]
+    public async Task<ActionResult<BoardResponse>> GetBoard(CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        return Ok(await bridge.GetBoardAsync(ct));
+    }
+
+    [HttpGet("tasks/{taskId:guid}")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<DashboardTaskDto>>> GetTask(
+        Guid taskId, CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var result = await bridge.GetTaskAsync(taskId, ct);
+        return MapResult(result, "get_task");
+    }
+
+    [HttpGet("tasks/{taskId:guid}/children")]
+    public async Task<ActionResult<List<DashboardTaskDto>>> GetChildren(
+        Guid taskId, CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        return Ok(await bridge.GetChildTasksAsync(taskId, ct));
+    }
+
+    [HttpGet("tasks/{taskId:guid}/activity")]
+    public async Task<ActionResult<TaskBridgeCommandResponse<List<ActivityEntryDto>>>> GetActivity(
+        Guid taskId, CancellationToken ct)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var events = await bridge.GetTaskActivityAsync(taskId, ct);
+        var entries = events.Select(e => new ActivityEntryDto(e.Id, e.Type, e.Message, e.CreatedAt)).ToList();
+
+        return Ok(new TaskBridgeCommandResponse<List<ActivityEntryDto>>
+        {
+            Ok = true,
+            Command = "get_activity",
+            Data = entries
+        });
+    }
+
+    [HttpGet("agent-overview")]
+    public async Task<ActionResult<AgentWorkflowOverview>> GetAgentOverview(
+        CancellationToken ct,
+        [FromQuery] int staleHours = 2)
+    {
+        var resolution = await TryResolveAgentAsync(ct);
+        if (!resolution.Success)
+            return resolution.ErrorResult!;
+
+        var threshold = TimeSpan.FromHours(Math.Max(1, staleHours));
+        return Ok(await bridge.GetAgentOverviewAsync(threshold, ct));
+    }
+
+    private async Task<(bool Success, string AgentId, ActionResult? ErrorResult)> TryResolveAgentAsync(CancellationToken ct)
+    {
+        var allowedAgentIds = await agentService.GetAllowedAgentIdsAsync(ct);
+
+        var agentHeader = Request.Headers["X-Agent-Id"].FirstOrDefault();
+        if (!string.IsNullOrWhiteSpace(agentHeader))
+        {
+            var normalizedHeader = agentHeader.Trim().ToLowerInvariant();
+            if (allowedAgentIds.Contains(normalizedHeader))
+                return (true, normalizedHeader, null);
+
+            logger.LogWarning("Bridge: ignoring unknown X-Agent-Id '{AgentId}' from {Ip} and continuing auth fallback",
+                normalizedHeader,
+                HttpContext.Connection.RemoteIpAddress);
+        }
+
+        if (User.Identity?.IsAuthenticated == true)
+        {
+            var normalizedClaim = User.FindFirst(ClaimTypes.NameIdentifier)?.Value?.Trim().ToLowerInvariant();
+            if (!string.IsNullOrWhiteSpace(normalizedClaim) && allowedAgentIds.Contains(normalizedClaim))
+                return (true, normalizedClaim, null);
+
+            if (User.IsInRole("owner") || User.IsInRole("admin") || User.IsInRole("member"))
+                return (true, "bao", null);
+        }
+
+        if (User.IsInRole("Service") && allowedAgentIds.Contains("nexus-system"))
+            return (true, "nexus-system", null);
+
+        var unauthorized = Unauthorized(new { error = ApikeyErrorMessage });
+        logger.LogWarning("Bridge: unauthenticated request rejected from {Ip}", HttpContext.Connection.RemoteIpAddress);
+        return (false, string.Empty, unauthorized);
+    }
+
+    private static string ResolveSource(string agentId) => agentId switch
+    {
+        "bao" or "nexus-system" => "bao",
+        _ => agentId
+    };
+
+    private static ActionResult MapResult<T>(TaskBridgeResult<T> result, string command) where T : class
+    {
+        if (result.Outcome == TaskBridgeOutcome.Success)
+            return new OkObjectResult(new TaskBridgeCommandResponse<T>
+            {
+                Ok = true,
+                Command = command,
+                Data = result.Data
+            });
+
+        var statusCode = result.Outcome switch
+        {
+            TaskBridgeOutcome.NotFound => 404,
+            TaskBridgeOutcome.InvalidState => 422,
+            TaskBridgeOutcome.Unauthorized => 403,
+            TaskBridgeOutcome.ValidationError => 400,
+            _ => 500
+        };
+
+        return new ObjectResult(new TaskBridgeCommandResponse<T>
+        {
+            Ok = false,
+            Command = command,
+            Error = result.Error ?? "Unknown error"
+        }) { StatusCode = statusCode };
+    }
+
+    private static ActionResult MapActivityResult(TaskBridgeResult<Data.ActivityEvent> result, string command)
+    {
+        if (result.Outcome == TaskBridgeOutcome.Success)
+            return new OkObjectResult(new TaskBridgeCommandResponse<ActivityEntryDto>
+            {
+                Ok = true,
+                Command = command,
+                Data = result.Data is null ? null : new ActivityEntryDto(
+                    result.Data.Id, result.Data.Type, result.Data.Message, result.Data.CreatedAt)
+            });
+
+        var statusCode = result.Outcome switch
+        {
+            TaskBridgeOutcome.NotFound => 404,
+            TaskBridgeOutcome.ValidationError => 400,
+            _ => 500
+        };
+
+        return new ObjectResult(new TaskBridgeCommandResponse<ActivityEntryDto>
+        {
+            Ok = false,
+            Command = command,
+            Error = result.Error ?? "Unknown error"
+        }) { StatusCode = statusCode };
+    }
+}
+
+public sealed class TaskBridgeCommandResponse<T>
+{
+    public bool Ok { get; init; }
+    public string Command { get; init; } = string.Empty;
+    public T? Data { get; init; }
+    public string? Error { get; init; }
+    public string Timestamp { get; init; } = DateTimeOffset.UtcNow.ToString("o");
+}
+
+public sealed record BridgeCreateTaskCommand(
+    string Title,
+    string? Detail = null,
+    string? Priority = null,
+    string? AssignedTo = null,
+    Guid? ProjectId = null
+);
+
+public sealed record BridgeCreateChildTaskCommand(
+    string Title,
+    string? Detail = null,
+    string? Priority = null,
+    string? AssignedTo = null,
+    string? ExpectedFrom = null
+);
+
+public sealed record BridgeUpdateStatusCommand(string State);
+
+public sealed record BridgeAppendActivityCommand(
+    string Message,
+    string? Type = null
+);
+
+public sealed record BridgeHandoffCommand(
+    string TargetAgent,
+    string? Note = null
+);
+
+public sealed record ActivityEntryDto(
+    long Id,
+    string Type,
+    string Message,
+    DateTimeOffset CreatedAt
+);

backend/Controllers/HealthController.cs

@@ -40,14 +40,14 @@ public class HealthController(IAgentRuntime runtime, HealthCheckService healthCh
             {
                 status = e.Value.Status.ToString(),
                 description = e.Value.Description,
-                data = e.Value.Data
+                data = (IReadOnlyDictionary<string, object?>)e.Value.Data
             });
 
         entries["runtime"] = new
         {
             status = runtimeStatus,
-            description = runtimeDetail ?? "Runtime status checked",
-            data = (IReadOnlyDictionary<string, object>)new Dictionary<string, object>()
+            description = runtimeDetail,
+            data = (IReadOnlyDictionary<string, object?>)new Dictionary<string, object?>()
         };
 
         var isHealthy = report.Status == HealthStatus.Healthy && runtimeStatus == "Online";

backend/Controllers/NotificationsController.cs

@@ -31,6 +31,16 @@ public class NotificationsController(INotificationService notificationService) :
         return Ok(new UnreadCountDto(count));
     }
 
+    [HttpGet("snapshot")]
+    public async Task<ActionResult<NotificationSnapshotDto>> GetSnapshot(
+        [FromQuery] string forUser = "bao",
+        [FromQuery] int limit = 50,
+        [FromQuery] bool unreadOnly = false,
+        CancellationToken ct = default)
+    {
+        return Ok(await notificationService.GetSnapshotAsync(forUser, limit, unreadOnly, ct));
+    }
+
     [HttpPatch("{id:guid}/read")]
     public async Task<ActionResult> MarkAsRead(Guid id, CancellationToken ct = default)
     {

backend/Controllers/ProjectsController.cs

@@ -1,9 +1,11 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Nexus.Api.DTOs;
 using Nexus.Api.Services;
 
 namespace Nexus.Api.Controllers;
 
+[Authorize]
 [ApiController]
 [Route("api/v1/projects")]
 public class ProjectsController(IProjectService projectService) : ControllerBase

backend/Controllers/TasksController.cs

@@ -7,9 +7,10 @@ using Nexus.Api.Services;
 
 namespace Nexus.Api.Controllers;
 
+[Authorize]
 [ApiController]
 [Route("api/v1/tasks")]
-public class TasksController(ITaskService taskService) : ControllerBase
+public class TasksController(ITaskService taskService, IAgentService agentService) : ControllerBase
 {
     [HttpGet]
     public async Task<IResult> GetAll(CancellationToken ct)
@@ -111,21 +112,57 @@ public class TasksController(ITaskService taskService) : ControllerBase
     /// <summary>
     /// Gibt das Task-Board zurück (gruppiert nach Status, priorisiert sortiert).
     /// Wird vom Iris Autonomous Worker genutzt.
+    ///
+    /// SICHERHEIT: Erfordert X-Agent-Id Header (bel. erkannter Agent) ODER
+    /// X-Nexus-Api-Key / JWT. Kein [AllowAnonymous] mehr.
+    /// Für Agent-zu-Agent-Kommunikation den /api/bridge/board Endpunkt nutzen.
     /// </summary>
-    [AllowAnonymous]
     [HttpGet("board")]
     public async Task<IResult> GetBoard(CancellationToken ct)
-        => Results.Ok(await taskService.GetBoardAsync(ct));
+    {
+        // Erfordert mindestens einen identifizierbaren Agent-Aufrufer
+        var agentHeader = await GetAllowedAgentHeaderAsync(ct);
+        var isApiKey = HttpContext.User.IsInRole("Service");
+        var isAuth = HttpContext.User.Identity?.IsAuthenticated == true;
+
+        if (string.IsNullOrWhiteSpace(agentHeader) && !isApiKey && !isAuth)
+            return Results.Unauthorized();
+
+        return Results.Ok(await taskService.GetBoardAsync(ct));
+    }
 
     /// <summary>
     /// Setzt stale Tasks (InProgress, älter als N Stunden) zurück auf Backlog.
     /// Wird vom Iris Autonomous Worker genutzt.
+    ///
+    /// SICHERHEIT: Erfordert X-Agent-Id Header (nur iris) ODER
+    /// X-Nexus-Api-Key / JWT-authenticated user.
+    /// Für Agent-zu-Agent-Kommunikation den /api/bridge Endpunkt nutzen.
     /// </summary>
-    [AllowAnonymous]
     [HttpPost("reset-stale")]
     public async Task<IResult> ResetStale([FromBody] ResetStaleRequest request, CancellationToken ct)
     {
+        var agentHeader = await GetAllowedAgentHeaderAsync(ct);
+        var isApiKey = HttpContext.User.IsInRole("Service");
+        var isAuth = HttpContext.User.Identity?.IsAuthenticated == true;
+
+        // Nur iris, nexus-system (ApiKey) oder JWT-authenticated user
+        var isIris = string.Equals(agentHeader, "iris", StringComparison.OrdinalIgnoreCase);
+        if (!isIris && !isApiKey && !isAuth)
+            return Results.Unauthorized();
+
         var count = await taskService.ResetStaleAsync(request.StaleHours, ct);
         return Results.Ok(new ResetStaleResponse(count));
     }
+
+    private async Task<string?> GetAllowedAgentHeaderAsync(CancellationToken ct)
+    {
+        var headerValue = HttpContext.Request.Headers["X-Agent-Id"].FirstOrDefault();
+        if (string.IsNullOrWhiteSpace(headerValue))
+            return null;
+
+        var normalized = headerValue.Trim().ToLowerInvariant();
+        var allowed = await agentService.GetAllowedAgentIdsAsync(ct);
+        return allowed.Contains(normalized) ? normalized : null;
+    }
 }

backend/Extensions/ServiceCollectionExtensions.cs

@@ -216,9 +216,13 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<IMemoryService, MemoryService>();
         services.AddSingleton<IIncidentService, IncidentService>();
         services.AddSingleton<IDocService, DocService>();
+        services.AddSingleton<ILiveUpdateService, LiveUpdateService>();
         services.AddScoped<INotificationService, NotificationService>();
         services.AddScoped<ICalendarService, CalendarService>();
 
+        // ── Backend Bridge (Agent-Command-Service) ──
+        services.AddScoped<ITaskBridgeService, TaskBridgeService>();
+
         return services;
     }
 

backend/Models/Dashboard.cs

@@ -93,7 +93,11 @@ public sealed record DashboardTaskDto(
     bool IsAgentTask = false,
     string? ExpectedFrom = null,
     string? LastActivityMessage = null,
-    DateTimeOffset? LastActivityAt = null
+    DateTimeOffset? LastActivityAt = null,
+    List<DashboardTaskDto>? ChildTasks = null,
+    int ChildTaskCount = 0,
+    int OpenChildTaskCount = 0,
+    bool HasVisibleDelegation = false
 );
 
 public sealed record CreateDashboardTaskRequest(
@@ -182,3 +186,34 @@ public sealed record NotificationDto(
 );
 
 public sealed record UnreadCountDto(int Count);
+
+public sealed record LiveUpdateEnvelope(
+    string Type,
+    DateTimeOffset Timestamp,
+    object Payload,
+    long Sequence,
+    string Channel
+);
+
+public sealed record LiveCursorDto(
+    long Sequence,
+    DateTimeOffset Timestamp,
+    string Mode
+);
+
+public sealed record NotificationSnapshotDto(
+    List<NotificationDto> Notifications,
+    int UnreadCount,
+    string ForUser
+);
+
+public sealed record DashboardLiveSnapshotDto(
+    BoardResponse Board,
+    NotificationSnapshotDto Notifications,
+    LiveCursorDto Cursor
+);
+
+public sealed record DashboardLiveEventDto(
+    LiveUpdateEnvelope Envelope,
+    LiveCursorDto Cursor
+);

backend/Services/AgentService.cs

@@ -73,6 +73,7 @@ public interface IAgentService
 {
     Task<IReadOnlyCollection<AgentInfo>> GetAgentsAsync(CancellationToken cancellationToken);
     Task<AgentDetail?> GetAgentAsync(string id, CancellationToken cancellationToken);
+    Task<IReadOnlySet<string>> GetAllowedAgentIdsAsync(CancellationToken cancellationToken);
 }
 
 public sealed class AgentService(IConfiguration configuration, IAgentRuntime runtime) : IAgentService
@@ -151,6 +152,16 @@ public sealed class AgentService(IConfiguration configuration, IAgentRuntime run
         );
     }
 
+
+    public async Task<IReadOnlySet<string>> GetAllowedAgentIdsAsync(CancellationToken cancellationToken)
+    {
+        var configs = await LoadAgentConfigsAsync(cancellationToken);
+        return configs
+            .Where(config => !string.IsNullOrWhiteSpace(config.Id))
+            .Select(config => config.Id.Trim().ToLowerInvariant())
+            .ToHashSet(StringComparer.OrdinalIgnoreCase);
+    }
+
     private static string DeriveRole(string agentId) => agentId.ToLowerInvariant() switch
     {
         "iris" => "Orchestrator",

backend/Services/ILiveUpdateService.cs

@@ -0,0 +1,17 @@
+using System.Threading.Channels;
+using Nexus.Api.Models;
+
+namespace Nexus.Api.Services;
+
+public interface ILiveUpdateService
+{
+    Task<LiveUpdateSubscription> SubscribeAsync(long? afterSequence = null, CancellationToken ct = default);
+    LiveUpdateEnvelope Publish(string type, object payload, string channel = "dashboard");
+    long CurrentSequence { get; }
+}
+
+public sealed class LiveUpdateSubscription
+{
+    public ChannelReader<LiveUpdateEnvelope> Reader { get; init; } = default!;
+    public long StartingSequence { get; init; }
+}

backend/Services/INotificationService.cs

@@ -10,4 +10,5 @@ public interface INotificationService
     Task<bool> MarkAsReadAsync(Guid id, CancellationToken ct = default);
     Task<int> MarkAllAsReadAsync(string forUser, CancellationToken ct = default);
     Task<int> GetUnreadCountAsync(string forUser, CancellationToken ct = default);
+    Task<NotificationSnapshotDto> GetSnapshotAsync(string forUser, int limit = 50, bool unreadOnly = false, CancellationToken ct = default);
 }

backend/Services/ITaskBridgeService.cs

@@ -0,0 +1,133 @@
+using Nexus.Api.Data;
+using Nexus.Api.DTOs;
+using Nexus.Api.Models;
+
+namespace Nexus.Api.Services;
+
+/// <summary>
+/// Structured backend bridge for agent/task commands.
+/// Provides a clean, typed API for agents (Iris and sub-agents) to interact
+/// with the task board, activity log, and delegation workflow.
+///
+/// This is the internal service layer — never exposed directly to the browser.
+/// The GatewayBridgeController wraps this for agent-facing HTTP access.
+/// </summary>
+public interface ITaskBridgeService
+{
+    // ── Task CRUD (Agent-Commands) ──
+
+    /// <summary>
+    /// Creates a new top-level task (parent or standalone).
+    /// Returns the created task DTO.
+    /// </summary>
+    Task<TaskBridgeResult<DashboardTaskDto>> CreateTaskAsync(
+        string title,
+        string? detail = null,
+        string? source = "iris",
+        string? priority = "Normal",
+        string? assignedTo = null,
+        Guid? projectId = null,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Creates a child task linked to an existing parent.
+    /// This is the primary delegation command: iris creates a child task,
+    /// assigns it to a sub-agent, and tracks it on the board.
+    /// </summary>
+    Task<TaskBridgeResult<DashboardTaskDto>> CreateChildTaskAsync(
+        Guid parentTaskId,
+        string title,
+        string? detail = null,
+        string? source = "iris",
+        string? priority = "Normal",
+        string? assignedTo = null,
+        string? expectedFrom = null,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Updates the status/state of a task.
+    /// Enforces CanChangeState rules (only iris/bao/nexus-system may change state).
+    /// </summary>
+    Task<TaskBridgeResult<DashboardTaskDto>> UpdateStatusAsync(
+        Guid taskId,
+        string state,
+        string? callerAgent = null,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Appends an activity entry to a task (comment, status note, agent note).
+    /// Used by agents to annotate their progress on the board.
+    /// </summary>
+    Task<TaskBridgeResult<ActivityEvent>> AppendActivityAsync(
+        Guid taskId,
+        string message,
+        string? type = "comment",
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Handles a task handoff: sets ExpectedFrom to the target agent,
+    /// appends a handoff activity entry, and optionally updates assigned-to.
+    /// </summary>
+    Task<TaskBridgeResult<DashboardTaskDto>> HandoffAsync(
+        Guid taskId,
+        string targetAgent,
+        string? note = null,
+        CancellationToken ct = default);
+
+    // ── Query (Read) ──
+
+    /// <summary>
+    /// Returns the full task board state (grouped by status column).
+    /// </summary>
+    Task<BoardResponse> GetBoardAsync(CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns a single task by ID.
+    /// </summary>
+    Task<TaskBridgeResult<DashboardTaskDto>> GetTaskAsync(
+        Guid taskId,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns all child tasks for a given parent task.
+    /// </summary>
+    Task<IReadOnlyList<DashboardTaskDto>> GetChildTasksAsync(
+        Guid parentTaskId,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns task activity history.
+    /// </summary>
+    Task<List<ActivityEvent>> GetTaskActivityAsync(
+        Guid taskId,
+        CancellationToken ct = default);
+
+    // ── Agent Workflow ──
+
+    /// <summary>
+    /// Returns the agent-workflow overview: who is expected to respond,
+    /// stale tasks, workload distribution.
+    /// </summary>
+    Task<AgentWorkflowOverview> GetAgentOverviewAsync(
+        TimeSpan? staleThreshold = null,
+        CancellationToken ct = default);
+}
+
+/// <summary>
+/// Result pattern for task-bridge operations.
+/// WorkTask? is null on NotFound; state is stored in the Outcome.
+/// </summary>
+public sealed record TaskBridgeResult<T>(
+    TaskBridgeOutcome Outcome,
+    T? Data = default,
+    string? Error = null
+);
+
+public enum TaskBridgeOutcome
+{
+    Success,
+    NotFound,
+    InvalidState,
+    Unauthorized,
+    ValidationError
+}

backend/Services/LiveUpdateService.cs

@@ -0,0 +1,87 @@
+using System.Collections.Concurrent;
+using System.Threading.Channels;
+using Nexus.Api.Models;
+
+namespace Nexus.Api.Services;
+
+public sealed class LiveUpdateService : ILiveUpdateService
+{
+    private const int ReplayLimit = 256;
+
+    private readonly ConcurrentDictionary<Guid, Channel<LiveUpdateEnvelope>> _subscribers = new();
+    private readonly object _historyLock = new();
+    private readonly Queue<LiveUpdateEnvelope> _history = new();
+    private long _sequence;
+
+    public long CurrentSequence => Interlocked.Read(ref _sequence);
+
+    public Task<LiveUpdateSubscription> SubscribeAsync(long? afterSequence = null, CancellationToken ct = default)
+    {
+        var channel = Channel.CreateUnbounded<LiveUpdateEnvelope>(new UnboundedChannelOptions
+        {
+            SingleReader = true,
+            SingleWriter = false,
+            AllowSynchronousContinuations = false
+        });
+
+        var id = Guid.NewGuid();
+        _subscribers[id] = channel;
+
+        var replay = afterSequence.HasValue ? GetReplay(afterSequence.Value) : Array.Empty<LiveUpdateEnvelope>();
+        foreach (var envelope in replay)
+        {
+            channel.Writer.TryWrite(envelope);
+        }
+
+        ct.Register(() =>
+        {
+            if (_subscribers.TryRemove(id, out var removed))
+            {
+                removed.Writer.TryComplete();
+            }
+        });
+
+        return Task.FromResult(new LiveUpdateSubscription
+        {
+            Reader = channel.Reader,
+            StartingSequence = replay.LastOrDefault()?.Sequence ?? CurrentSequence
+        });
+    }
+
+    public LiveUpdateEnvelope Publish(string type, object payload, string channel = "dashboard")
+    {
+        var envelope = new LiveUpdateEnvelope(
+            type,
+            DateTimeOffset.UtcNow,
+            payload,
+            Interlocked.Increment(ref _sequence),
+            channel);
+
+        lock (_historyLock)
+        {
+            _history.Enqueue(envelope);
+            while (_history.Count > ReplayLimit)
+            {
+                _history.Dequeue();
+            }
+        }
+
+        foreach (var (id, subscriber) in _subscribers)
+        {
+            if (!subscriber.Writer.TryWrite(envelope) && _subscribers.TryRemove(id, out var removed))
+            {
+                removed.Writer.TryComplete();
+            }
+        }
+
+        return envelope;
+    }
+
+    private LiveUpdateEnvelope[] GetReplay(long afterSequence)
+    {
+        lock (_historyLock)
+        {
+            return _history.Where(item => item.Sequence > afterSequence).ToArray();
+        }
+    }
+}

backend/Services/NotificationService.cs

@@ -4,7 +4,7 @@ using Nexus.Api.Models;
 
 namespace Nexus.Api.Services;
 
-public sealed class NotificationService(NexusDbContext db) : INotificationService
+public sealed class NotificationService(NexusDbContext db, ILiveUpdateService liveUpdateService) : INotificationService
 {
     public async Task<Notification> CreateAsync(string type, string title, string? message, string forUser, Guid? taskId = null, CancellationToken ct = default)
     {
@@ -18,6 +18,7 @@ public sealed class NotificationService(NexusDbContext db) : INotificationServic
         };
         db.Notifications.Add(notification);
         await db.SaveChangesAsync(ct);
+        await PublishSnapshotAsync(notification.ForUser, ct);
         return notification;
     }
 
@@ -42,14 +43,17 @@ public sealed class NotificationService(NexusDbContext db) : INotificationServic
 
         notification.IsRead = true;
         await db.SaveChangesAsync(ct);
+        await PublishSnapshotAsync(notification.ForUser, ct);
         return true;
     }
 
     public async Task<int> MarkAllAsReadAsync(string forUser, CancellationToken ct = default)
     {
+        var normalizedUser = forUser.ToLowerInvariant();
         var count = await db.Notifications
-            .Where(n => n.ForUser == forUser.ToLowerInvariant() && !n.IsRead)
+            .Where(n => n.ForUser == normalizedUser && !n.IsRead)
             .ExecuteUpdateAsync(s => s.SetProperty(n => n.IsRead, true), ct);
+        await PublishSnapshotAsync(normalizedUser, ct);
         return count;
     }
 
@@ -58,4 +62,25 @@ public sealed class NotificationService(NexusDbContext db) : INotificationServic
         return await db.Notifications
             .CountAsync(n => n.ForUser == forUser.ToLowerInvariant() && !n.IsRead, ct);
     }
+
+    public async Task<NotificationSnapshotDto> GetSnapshotAsync(string forUser, int limit = 50, bool unreadOnly = false, CancellationToken ct = default)
+    {
+        var normalizedUser = forUser.ToLowerInvariant();
+        var notifications = await GetForUserAsync(normalizedUser, limit, unreadOnly, ct);
+        var unreadCount = await GetUnreadCountAsync(normalizedUser, ct);
+        return new NotificationSnapshotDto(
+            notifications.Select(MapToDto).ToList(),
+            unreadCount,
+            normalizedUser);
+    }
+
+    private async Task PublishSnapshotAsync(string forUser, CancellationToken ct)
+    {
+        var snapshot = await GetSnapshotAsync(forUser, ct: ct);
+        liveUpdateService.Publish("notifications.snapshot", snapshot, "notifications");
+    }
+
+    private static NotificationDto MapToDto(Notification n) => new(
+        n.Id, n.Type, n.Title, n.Message,
+        n.ForUser, n.TaskId, n.IsRead, n.CreatedAt);
 }

backend/Services/TaskBridgeService.cs

@@ -0,0 +1,248 @@
+using Nexus.Api.Data;
+using Nexus.Api.DTOs;
+using Nexus.Api.Models;
+using Nexus.Api.Repositories;
+
+namespace Nexus.Api.Services;
+
+/// <summary>
+/// Concrete implementation of ITaskBridgeService.
+/// Wraps ITaskService, IActivityRepository, INotificationService, and ILiveUpdateService
+/// into structured, predictable commands for agent-facing usage.
+///
+/// All operations produce typed TaskBridgeResult<T> with explicit error codes,
+/// making agent consumption safe and debuggable.
+/// </summary>
+public sealed class TaskBridgeService(
+    ITaskService taskService,
+    IActivityRepository activityRepo,
+    INotificationService notificationService,
+    ILiveUpdateService liveUpdateService) : ITaskBridgeService
+{
+    private static readonly HashSet<string> ValidStates =
+        new(TaskStateHelper.AllStates, StringComparer.OrdinalIgnoreCase);
+
+    // ──────────────────────────────── Create Task ────────────────────────────────
+
+    public async Task<TaskBridgeResult<DashboardTaskDto>> CreateTaskAsync(
+        string title,
+        string? detail = null,
+        string? source = "iris",
+        string? priority = "Normal",
+        string? assignedTo = null,
+        Guid? projectId = null,
+        CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(title))
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.ValidationError, "Title is required.");
+
+        var normalizedSource = NormalizeSource(source);
+        var normalizedAssignee = NormalizeAssignedTo(assignedTo);
+
+        var task = await taskService.CreateDashboardTaskAsync(
+            title.Trim(), detail?.Trim(), normalizedSource, priority, normalizedAssignee, parentTaskId: null, ct);
+
+        var dto = MapToDto(task);
+        return Success(dto);
+    }
+
+    // ──────────────────────────────── Create Child Task ──────────────────────────
+
+    public async Task<TaskBridgeResult<DashboardTaskDto>> CreateChildTaskAsync(
+        Guid parentTaskId,
+        string title,
+        string? detail = null,
+        string? source = "iris",
+        string? priority = "Normal",
+        string? assignedTo = null,
+        string? expectedFrom = null,
+        CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(title))
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.ValidationError, "Title is required.");
+
+        // Verify parent exists
+        var parent = await taskService.GetByIdAsync(parentTaskId, ct);
+        if (parent is null)
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.NotFound, $"Parent task {parentTaskId} not found.");
+
+        var normalizedAssignee = NormalizeAssignedTo(assignedTo);
+
+        var task = await taskService.CreateAgentTaskAsync(
+            title.Trim(), detail?.Trim(), NormalizeSource(source),
+            priority, normalizedAssignee, expectedFrom, parentTaskId, ct);
+
+        // If parent was in Backlog, move it to InProgress (coordination starts)
+        if (string.Equals(parent.State, "Backlog", StringComparison.OrdinalIgnoreCase))
+        {
+            await taskService.UpdateStatusAsync(parentTaskId, "In progress", ct);
+        }
+
+        var dto = MapToDto(task);
+        return Success(dto);
+    }
+
+    // ──────────────────────────────── Update Status ──────────────────────────────
+
+    public async Task<TaskBridgeResult<DashboardTaskDto>> UpdateStatusAsync(
+        Guid taskId,
+        string state,
+        string? callerAgent = null,
+        CancellationToken ct = default)
+    {
+        if (!ValidStates.Contains(state))
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.ValidationError,
+                $"Invalid state '{state}'. Valid: {string.Join(", ", TaskStateHelper.AllStates)}");
+
+        var task = await taskService.GetByIdAsync(taskId, ct);
+        if (task is null)
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.NotFound, $"Task {taskId} not found.");
+
+        // Check authorization
+        if (!TaskStateHelper.CanChangeState(callerAgent, task))
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.Unauthorized,
+                $"Agent '{callerAgent}' is not authorized to change task state. Only iris and bao may move tasks.");
+
+        var result = await taskService.UpdateStatusAsync(taskId, state, ct);
+        if (result.Outcome != TaskOperationOutcome.Success)
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.InvalidState, "Status update rejected.");
+
+        var dto = MapToDto(result.Task!);
+        return Success(dto);
+    }
+
+    // ──────────────────────────────── Append Activity ────────────────────────────
+
+    public async Task<TaskBridgeResult<ActivityEvent>> AppendActivityAsync(
+        Guid taskId,
+        string message,
+        string? type = "comment",
+        CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(message))
+            return Error<ActivityEvent>(TaskBridgeOutcome.ValidationError, "Message is required.");
+
+        var task = await taskService.GetByIdAsync(taskId, ct);
+        if (task is null)
+            return Error<ActivityEvent>(TaskBridgeOutcome.NotFound, $"Task {taskId} not found.");
+
+        var ev = new ActivityEvent
+        {
+            Type = type ?? "comment",
+            Message = message.Trim(),
+            TaskId = taskId
+        };
+
+        await activityRepo.AddAsync(ev, ct);
+
+        // Trigger live update so the board refreshes
+        var board = await taskService.GetBoardAsync(ct);
+        liveUpdateService.Publish("tasks.board.snapshot", board);
+
+        return Success(ev);
+    }
+
+    // ──────────────────────────────── Handoff ────────────────────────────────────
+
+    public async Task<TaskBridgeResult<DashboardTaskDto>> HandoffAsync(
+        Guid taskId,
+        string targetAgent,
+        string? note = null,
+        CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(targetAgent))
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.ValidationError, "Target agent is required.");
+
+        var task = await taskService.GetByIdAsync(taskId, ct);
+        if (task is null)
+            return Error<DashboardTaskDto>(TaskBridgeOutcome.NotFound, $"Task {taskId} not found.");
+
+        var normalizedTarget = targetAgent.Trim().ToLowerInvariant();
+        var handoffNote = string.IsNullOrWhiteSpace(note)
+            ? $"Handoff → {normalizedTarget}"
+            : $"Handoff → {normalizedTarget}: {note.Trim()}";
+
+        // Update expected-from and optionally assigned-to
+        task.ExpectedFrom = normalizedTarget;
+
+        // If this is a child task (has parent), keep assigned-to on the child
+        // If standalone, set assigned-to to the target
+        if (!task.ParentTaskId.HasValue)
+            task.AssignedTo = normalizedTarget;
+
+        await taskService.UpdateDashboardTaskAsync(
+            taskId, title: null, detail: null, source: null,
+            priority: null, assignedTo: task.AssignedTo, dueDate: null, ct);
+
+        // Append handoff activity
+        await AppendActivityAsync(taskId, handoffNote, "handoff", ct);
+
+        // Notify the target
+        await notificationService.CreateAsync(
+            "task_assigned",
+            $"Handoff: {task.Title}",
+            handoffNote,
+            normalizedTarget,
+            task.Id,
+            ct);
+
+        var dto = MapToDto(task);
+        return Success(dto);
+    }
+
+    // ──────────────────────────────── Query ──────────────────────────────────────
+
+    public async Task<BoardResponse> GetBoardAsync(CancellationToken ct = default)
+        => await taskService.GetBoardAsync(ct);
+
+    public async Task<TaskBridgeResult<DashboardTaskDto>> GetTaskAsync(
+        Guid taskId, CancellationToken ct = default)
+    {
+        var dto = await taskService.GetDashboardTaskByIdAsync(taskId, ct);
+        return dto is null
+            ? Error<DashboardTaskDto>(TaskBridgeOutcome.NotFound, $"Task {taskId} not found.")
+            : Success(dto);
+    }
+
+    public async Task<IReadOnlyList<DashboardTaskDto>> GetChildTasksAsync(
+        Guid parentTaskId, CancellationToken ct = default)
+    {
+        var children = await taskService.GetChildTasksAsync(parentTaskId, ct);
+        return children.Select(MapToDto).ToList();
+    }
+
+    public async Task<List<ActivityEvent>> GetTaskActivityAsync(
+        Guid taskId, CancellationToken ct = default)
+        => await taskService.GetTaskActivityAsync(taskId, ct);
+
+    public async Task<AgentWorkflowOverview> GetAgentOverviewAsync(
+        TimeSpan? staleThreshold = null, CancellationToken ct = default)
+    {
+        var threshold = staleThreshold ?? TimeSpan.FromHours(2);
+        return await taskService.GetAgentWorkflowOverviewAsync(threshold, ct);
+    }
+
+    // ──────────────────────────────── Helpers ────────────────────────────────────
+
+    private static TaskBridgeResult<T> Success<T>(T data) =>
+        new(TaskBridgeOutcome.Success, data);
+
+    private static TaskBridgeResult<T> Error<T>(TaskBridgeOutcome outcome, string error) =>
+        new(outcome, Data: default, Error: error);
+
+    private static string NormalizeSource(string? source) =>
+        string.IsNullOrWhiteSpace(source) ? "iris" : source.Trim().ToLowerInvariant();
+
+    private static string? NormalizeAssignedTo(string? assignedTo)
+    {
+        if (string.IsNullOrWhiteSpace(assignedTo)) return null;
+        var valid = new HashSet<string> { "bao", "iris", "programmer", "reviewer", "architekt", "researcher", "executor" };
+        var lower = assignedTo.Trim().ToLowerInvariant();
+        return valid.Contains(lower) ? lower : null;
+    }
+
+    private static DashboardTaskDto MapToDto(WorkTask t) => new(
+        t.Id, t.Title, t.Detail, t.Source, t.State, t.Priority, t.AssignedTo,
+        t.ParentTaskId, t.DueDate, t.CreatedAt, t.UpdatedAt,
+        t.IsAgentTask, t.ExpectedFrom);
+}

backend/Services/TaskService.cs

@@ -9,7 +9,8 @@ public sealed class TaskService(
     ITaskRepository taskRepo,
     IActivityRepository activityRepo,
     INotificationService notificationService,
-    IHttpContextAccessor httpContextAccessor) : ITaskService
+    IHttpContextAccessor httpContextAccessor,
+    ILiveUpdateService liveUpdateService) : ITaskService
 {
     private static readonly HashSet<string> ValidAssignees =
         ["bao", "iris", "programmer", "reviewer", "architekt", "researcher", "executor"];
@@ -22,11 +23,12 @@ public sealed class TaskService(
 
     public async Task<DashboardTaskDto?> GetDashboardTaskByIdAsync(Guid id, CancellationToken ct = default)
     {
-        var task = await taskRepo.GetByIdAsync(id, ct);
+        var allTasks = (await taskRepo.GetAllAsync(ct)).ToList();
+        var task = allTasks.FirstOrDefault(t => t.Id == id);
         if (task is null) return null;
 
-        var activity = await activityRepo.GetRecentForTasksAsync([task.Id], ct);
-        return MapToDtoWithActivity(task, activity);
+        var activity = await activityRepo.GetRecentForTasksAsync(allTasks.Select(t => t.Id), ct);
+        return MapToDtoWithChildren(task, allTasks, activity);
     }
 
     public async Task<IReadOnlyList<WorkTask>> GetPendingApprovalAsync(CancellationToken ct = default)
@@ -42,6 +44,7 @@ public sealed class TaskService(
         };
         await taskRepo.AddAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task {task.Title} created", TaskId = task.Id }, ct);
+        await PublishBoardSnapshotAsync(ct);
         return task;
     }
 
@@ -56,6 +59,7 @@ public sealed class TaskService(
         task.State = TaskStateHelper.ToStateString(TaskState.Done);
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task {task.Title} approved", TaskId = task.Id }, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -70,6 +74,7 @@ public sealed class TaskService(
         task.State = TaskStateHelper.ToStateString(TaskState.Backlog);
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task {task.Title} rejected, returned to backlog", TaskId = task.Id }, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -81,7 +86,6 @@ public sealed class TaskService(
         var task = await taskRepo.GetByIdAsync(id, ct);
         if (task is null) return new TaskOperationResult(TaskOperationOutcome.NotFound);
 
-        // Enforce workflow rules
         var caller = ResolveCaller();
         if (!TaskStateHelper.CanChangeState(caller, task))
             return new TaskOperationResult(TaskOperationOutcome.InvalidState);
@@ -90,6 +94,7 @@ public sealed class TaskService(
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task {task.Title} moved to {task.State}", TaskId = task.Id }, ct);
         await CreateStatusChangeNotificationsAsync(task, canonical, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -112,13 +117,14 @@ public sealed class TaskService(
         }
         if (request.ProjectId.HasValue)
         {
-            changes.Add($"Projekt-ID geändert");
+            changes.Add("Projekt-ID geändert");
             task.ProjectId = request.ProjectId.Value == Guid.Empty ? null : request.ProjectId;
         }
 
         await taskRepo.UpdateAsync(task, ct);
         var changeSummary = changes.Count > 0 ? string.Join("; ", changes) : "keine sichtbaren Änderungen";
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task \"{task.Title}\" aktualisiert: {changeSummary}", TaskId = task.Id }, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -132,11 +138,10 @@ public sealed class TaskService(
 
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task {task.Title} deleted", TaskId = task.Id }, ct);
         await taskRepo.DeleteAsync(task, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success);
     }
 
-    // ── Dashboard-facing operations ──
-
     public async Task<IReadOnlyList<WorkTask>> GetOpenAsync(CancellationToken ct = default)
     {
         var all = await taskRepo.GetAllAsync(ct);
@@ -145,10 +150,6 @@ public sealed class TaskService(
                   .ToList();
     }
 
-    /// <summary>
-    /// Returns agent-tasks that are still open and where an agent is expected to respond.
-    /// Iris Dashboard uses this to see who she is waiting for.
-    /// </summary>
     public async Task<IReadOnlyList<WorkTask>> GetWaitingTasksAsync(CancellationToken ct = default)
     {
         var all = await taskRepo.GetAllAsync(ct);
@@ -159,22 +160,15 @@ public sealed class TaskService(
             .ToList();
     }
 
-    /// <summary>
-    /// Returns agent-tasks grouped by which agent is expected to respond,
-    /// with stale-detection: parent tasks that remain in progress while child work
-    /// is active, and any in-progress task that has not been updated within the stale threshold.
-    /// </summary>
     public async Task<AgentWorkflowOverview> GetAgentWorkflowOverviewAsync(TimeSpan staleThreshold, CancellationToken ct = default)
     {
-        var all = await taskRepo.GetAllAsync(ct);
+        var all = (await taskRepo.GetAllAsync(ct)).ToList();
         var threshold = DateTimeOffset.UtcNow - staleThreshold;
-
         var agentTasks = all.Where(t => t.IsAgentTask).ToList();
-
         var activity = await activityRepo.GetRecentForTasksAsync(agentTasks.Select(t => t.Id), ct);
 
         List<DashboardTaskDto> map(IEnumerable<WorkTask> tasks)
-            => tasks.Select(task => MapToDtoWithActivity(task, activity)).ToList();
+            => tasks.Select(task => MapToDtoWithChildren(task, all, activity)).ToList();
 
         var waitingForBao = map(agentTasks
             .Where(t => string.Equals(t.ExpectedFrom, "bao", StringComparison.OrdinalIgnoreCase) &&
@@ -193,19 +187,15 @@ public sealed class TaskService(
             }));
 
         var staleTasks = map(agentTasks
-            .Where(t =>
-                string.Equals(t.State, "In progress", StringComparison.OrdinalIgnoreCase) &&
-                t.UpdatedAt < threshold));
+            .Where(t => string.Equals(t.State, "In progress", StringComparison.OrdinalIgnoreCase) && t.UpdatedAt < threshold));
 
-        return new AgentWorkflowOverview(waitingForBao, waitingForIris, waitingForOthers,
-            staleTasks, staleThreshold);
+        return new AgentWorkflowOverview(waitingForBao, waitingForIris, waitingForOthers, staleTasks, staleThreshold);
     }
 
     public async Task<WorkTask> CreateDashboardTaskAsync(
         string title, string? detail, string? source, string? priority,
         string? assignedTo, Guid? parentTaskId = null, CancellationToken ct = default)
     {
-        // Validate parent task exists if specified
         if (parentTaskId.HasValue)
         {
             var parent = await taskRepo.GetByIdAsync(parentTaskId.Value, ct);
@@ -215,6 +205,7 @@ public sealed class TaskService(
 
         var normalizedSource = string.IsNullOrWhiteSpace(source) ? "bao" : source.Trim().ToLowerInvariant();
         var normalizedAssignee = ValidateAssignedTo(assignedTo);
+        var isVisibleDelegation = parentTaskId.HasValue;
 
         var task = new WorkTask
         {
@@ -224,16 +215,24 @@ public sealed class TaskService(
             Priority = string.IsNullOrWhiteSpace(priority) ? "Normal" : priority.Trim(),
             AssignedTo = normalizedAssignee,
             ParentTaskId = parentTaskId,
-            IsAgentTask = parentTaskId.HasValue
+            IsAgentTask = isVisibleDelegation
         };
         await taskRepo.AddAsync(task, ct);
 
-        var message = $"Task \"{task.Title}\" created ({task.Source})";
+        var activityMessages = new List<string> { $"Task \"{task.Title}\" created ({task.Source})" };
         if (parentTaskId.HasValue)
-            message += $" [child of {parentTaskId.Value}]";
-        await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = message, TaskId = task.Id }, ct);
+        {
+            activityMessages.Add($"Sichtbare Delegation erstellt: Child-Task von {parentTaskId.Value}.");
+            await activityRepo.AddAsync(new ActivityEvent
+            {
+                Type = "delegation",
+                Message = $"Board-first Delegation: Child-Task \"{task.Title}\" für {normalizedAssignee ?? task.Source} sichtbar angelegt.",
+                TaskId = parentTaskId.Value
+            }, ct);
+        }
+
+        await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = string.Join(" ", activityMessages), TaskId = task.Id }, ct);
 
-        // Auto-notify: if assigned to bao, create a task_assigned notification
         if (string.Equals(normalizedAssignee, "bao", StringComparison.OrdinalIgnoreCase))
         {
             await notificationService.CreateAsync(
@@ -245,6 +244,7 @@ public sealed class TaskService(
                 ct);
         }
 
+        await PublishBoardSnapshotAsync(ct);
         return task;
     }
 
@@ -252,13 +252,12 @@ public sealed class TaskService(
         string title, string? detail, string? source, string? priority,
         string? assignedTo, string? expectedFrom, Guid? parentTaskId = null, CancellationToken ct = default)
     {
+        var normalizedExpectedFrom = string.IsNullOrWhiteSpace(expectedFrom) ? null : expectedFrom.Trim().ToLowerInvariant();
         var task = await CreateDashboardTaskAsync(title, detail, source, priority, assignedTo, parentTaskId, ct);
 
         task.IsAgentTask = true;
-        task.ExpectedFrom = string.IsNullOrWhiteSpace(expectedFrom) ? null : expectedFrom.Trim().ToLowerInvariant();
+        task.ExpectedFrom = normalizedExpectedFrom;
         task.State = TaskStateHelper.ToStateString(TaskState.InProgress);
-
-        // Persist the agent-task-specific fields
         await taskRepo.UpdateAsync(task, ct);
 
         await activityRepo.AddAsync(new ActivityEvent
@@ -268,7 +267,16 @@ public sealed class TaskService(
             TaskId = task.Id
         }, ct);
 
-        // Notify iris about new agent-task
+        if (parentTaskId.HasValue)
+        {
+            await activityRepo.AddAsync(new ActivityEvent
+            {
+                Type = "delegation",
+                Message = $"Parent-/Child-Delegation sichtbar: Parent {parentTaskId.Value}, Child {task.Id}, wartet auf {task.ExpectedFrom ?? task.AssignedTo ?? "unbekannt"}.",
+                TaskId = parentTaskId.Value
+            }, ct);
+        }
+
         await notificationService.CreateAsync(
             "agent_task_created",
             $"Neuer Agent-Task: {task.Title}",
@@ -277,6 +285,7 @@ public sealed class TaskService(
             task.Id,
             ct);
 
+        await PublishBoardSnapshotAsync(ct);
         return task;
     }
 
@@ -320,13 +329,10 @@ public sealed class TaskService(
                 task.AssignedTo = validated;
             }
         }
-        if (dueDate.HasValue)
+        if (dueDate.HasValue && task.DueDate?.Date != dueDate.Value.Date)
         {
-            if (task.DueDate?.Date != dueDate.Value.Date)
-            {
-                changes.Add($"Fällig: {task.DueDate?.ToString("yyyy-MM-dd") ?? "kein Datum"} → {dueDate.Value:yyyy-MM-dd}");
-                task.DueDate = dueDate;
-            }
+            changes.Add($"Fällig: {task.DueDate?.ToString("yyyy-MM-dd") ?? "kein Datum"} → {dueDate.Value:yyyy-MM-dd}");
+            task.DueDate = dueDate;
         }
 
         await taskRepo.UpdateAsync(task, ct);
@@ -339,18 +345,18 @@ public sealed class TaskService(
             TaskId = task.Id
         }, ct);
 
-        // Notification: wenn Bao die Task geändert hat, Iris benachrichtigen
         if (changes.Count > 0 && caller == "bao")
         {
             await notificationService.CreateAsync(
                 "task_content_changed",
                 $"Bao hat \"{task.Title}\" geändert",
-                $"{changeSummary}",
+                changeSummary,
                 "iris",
                 task.Id,
                 ct);
         }
 
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -362,7 +368,6 @@ public sealed class TaskService(
         var task = await taskRepo.GetByIdAsync(id, ct);
         if (task is null) return new TaskOperationResult(TaskOperationOutcome.NotFound);
 
-        // Enforce workflow rules
         var caller = ResolveCaller();
         if (!TaskStateHelper.CanChangeState(caller, task))
             return new TaskOperationResult(TaskOperationOutcome.InvalidState);
@@ -372,6 +377,7 @@ public sealed class TaskService(
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task \"{task.Title}\" → {canonical}", TaskId = task.Id }, ct);
         await CreateStatusChangeNotificationsAsync(task, canonical, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -383,6 +389,7 @@ public sealed class TaskService(
         task.State = "Done";
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task \"{task.Title}\" completed via queue", TaskId = task.Id }, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -401,14 +408,15 @@ public sealed class TaskService(
 
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task \"{task.Title}\" priority → {task.Priority}", TaskId = task.Id }, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
-    // ── Board operations ──
-
     public async Task<BoardResponse> GetBoardAsync(CancellationToken ct = default)
     {
-        var all = await taskRepo.GetAllAsync(ct);
+        var all = (await taskRepo.GetAllAsync(ct)).ToList();
+        var activity = await activityRepo.GetRecentForTasksAsync(all.Select(t => t.Id), ct);
+
         var offen = new List<DashboardTaskDto>();
         var inProgress = new List<DashboardTaskDto>();
         var review = new List<DashboardTaskDto>();
@@ -417,21 +425,15 @@ public sealed class TaskService(
 
         foreach (var task in all)
         {
-            var dto = MapToDto(task);
+            var dto = MapToDtoWithChildren(task, all, activity);
             switch (task.State.ToLowerInvariant())
             {
-                case "backlog":
-                    offen.Add(dto); break;
-                case "in progress":
-                    inProgress.Add(dto); break;
-                case "review":
-                    review.Add(dto); break;
-                case "blocked":
-                    blocked.Add(dto); break;
-                case "done":
-                    done.Add(dto); break;
-                default:
-                    offen.Add(dto); break;
+                case "backlog": offen.Add(dto); break;
+                case "in progress": inProgress.Add(dto); break;
+                case "review": review.Add(dto); break;
+                case "blocked": blocked.Add(dto); break;
+                case "done": done.Add(dto); break;
+                default: offen.Add(dto); break;
             }
         }
 
@@ -444,6 +446,12 @@ public sealed class TaskService(
         return new BoardResponse(offen, inProgress, review, blocked, done);
     }
 
+    private async Task PublishBoardSnapshotAsync(CancellationToken ct = default)
+    {
+        var board = await GetBoardAsync(ct);
+        liveUpdateService.Publish("tasks.board.snapshot", board, "board");
+    }
+
     private static int SortByPriorityThenCreatedAt(DashboardTaskDto a, DashboardTaskDto b)
     {
         var priorityCompare = PriorityScore(b.Priority).CompareTo(PriorityScore(a.Priority));
@@ -461,23 +469,14 @@ public sealed class TaskService(
 
     public async Task<TaskOperationResult> MoveTaskAsync(Guid id, string newState, CancellationToken ct = default)
     {
-        // Resolve canonical state: accept board group keys or canonical strings
-        var canonical = TaskStateHelper.AllStates
-            .FirstOrDefault(s => s.Equals(newState, StringComparison.OrdinalIgnoreCase));
-
-        if (canonical is null)
-        {
-            // Try mapping from board group key
-            canonical = TaskStateHelper.BoardGroupToState(newState);
-        }
-
+        var canonical = TaskStateHelper.AllStates.FirstOrDefault(s => s.Equals(newState, StringComparison.OrdinalIgnoreCase))
+                        ?? TaskStateHelper.BoardGroupToState(newState);
         if (canonical is null)
             return new TaskOperationResult(TaskOperationOutcome.InvalidState);
 
         var task = await taskRepo.GetByIdAsync(id, ct);
         if (task is null) return new TaskOperationResult(TaskOperationOutcome.NotFound);
 
-        // Enforce workflow rules
         var caller = ResolveCaller();
         if (!TaskStateHelper.CanChangeState(caller, task))
             return new TaskOperationResult(TaskOperationOutcome.InvalidState);
@@ -486,6 +485,7 @@ public sealed class TaskService(
         await taskRepo.UpdateAsync(task, ct);
         await activityRepo.AddAsync(new ActivityEvent { Type = "task", Message = $"Task \"{task.Title}\" moved to {canonical}", TaskId = task.Id }, ct);
         await CreateStatusChangeNotificationsAsync(task, canonical, ct);
+        await PublishBoardSnapshotAsync(ct);
         return new TaskOperationResult(TaskOperationOutcome.Success, task);
     }
 
@@ -499,9 +499,7 @@ public sealed class TaskService(
     {
         var all = await taskRepo.GetAllAsync(ct);
         var threshold = DateTimeOffset.UtcNow - staleThreshold;
-        var staleTasks = all.Where(t =>
-            string.Equals(t.State, "In progress", StringComparison.OrdinalIgnoreCase) &&
-            t.UpdatedAt < threshold).ToList();
+        var staleTasks = all.Where(t => string.Equals(t.State, "In progress", StringComparison.OrdinalIgnoreCase) && t.UpdatedAt < threshold).ToList();
 
         foreach (var task in staleTasks)
         {
@@ -516,6 +514,9 @@ public sealed class TaskService(
             }, ct);
         }
 
+        if (staleTasks.Count > 0)
+            await PublishBoardSnapshotAsync(ct);
+
         return staleTasks.Count;
     }
 
@@ -533,12 +534,31 @@ public sealed class TaskService(
         return all.Where(e => e.TaskId == taskId).ToList();
     }
 
+    private DashboardTaskDto MapToDtoWithChildren(WorkTask task, IReadOnlyList<WorkTask> allTasks, IEnumerable<ActivityEvent> activity)
+    {
+        var childTasks = allTasks.Where(t => t.ParentTaskId == task.Id)
+            .OrderByDescending(t => t.UpdatedAt)
+            .ToList();
+
+        var childDtos = childTasks.Select(child => MapToDtoWithActivity(child, activity, allTasks)).ToList();
+        var openChildTaskCount = childTasks.Count(child => !string.Equals(child.State, "Done", StringComparison.OrdinalIgnoreCase));
+
+        var dto = MapToDtoWithActivity(task, activity, allTasks);
+        return dto with
+        {
+            ChildTasks = childDtos,
+            ChildTaskCount = childDtos.Count,
+            OpenChildTaskCount = openChildTaskCount,
+            HasVisibleDelegation = dto.ParentTaskId.HasValue || childDtos.Count > 0 || dto.IsAgentTask
+        };
+    }
+
     private static DashboardTaskDto MapToDto(WorkTask t) => new(
         t.Id, t.Title, t.Detail, t.Source, t.State, t.Priority, t.AssignedTo,
         t.ParentTaskId, t.DueDate, t.CreatedAt, t.UpdatedAt,
         t.IsAgentTask, t.ExpectedFrom);
 
-    private static DashboardTaskDto MapToDtoWithActivity(WorkTask t, IEnumerable<ActivityEvent> activity)
+    private static DashboardTaskDto MapToDtoWithActivity(WorkTask t, IEnumerable<ActivityEvent> activity, IReadOnlyList<WorkTask>? _allTasks = null)
     {
         var last = activity
             .Where(e => e.TaskId == t.Id)
@@ -550,13 +570,13 @@ public sealed class TaskService(
             t.ParentTaskId, t.DueDate, t.CreatedAt, t.UpdatedAt,
             t.IsAgentTask, t.ExpectedFrom,
             last?.Message,
-            last?.CreatedAt);
+            last?.CreatedAt,
+            null,
+            0,
+            0,
+            t.ParentTaskId.HasValue || t.IsAgentTask);
     }
 
-    /// <summary>
-    /// Validates AssignedTo — only recognized agent values are accepted.
-    /// Returns null for invalid values.
-    /// </summary>
     private static string? ValidateAssignedTo(string? assignedTo)
     {
         if (string.IsNullOrWhiteSpace(assignedTo)) return null;
@@ -564,15 +584,10 @@ public sealed class TaskService(
         return ValidAssignees.Contains(lower) ? lower : null;
     }
 
-    /// <summary>
-    /// Resolves the caller identity from the HTTP context.
-    /// Reads the X-Agent-Id header for agent calls, falls back to JWT name.
-    /// Outside HTTP context → "nexus-system" (allowed for internal Cron/ResetStale ops).
-    /// </summary>
     private string ResolveCaller()
     {
         var httpContext = httpContextAccessor.HttpContext;
-        if (httpContext is null) return "nexus-system"; // internal system ops allowed
+        if (httpContext is null) return "nexus-system";
 
         var agentHeader = httpContext.Request.Headers["X-Agent-Id"].FirstOrDefault();
         if (!string.IsNullOrWhiteSpace(agentHeader))
@@ -583,12 +598,6 @@ public sealed class TaskService(
         return nameClaim?.ToLowerInvariant() ?? "";
     }
 
-    /// <summary>
-    /// Creates status-change notifications when a task moves to a new state.
-    /// - Wenn Bao ändert → Iris benachrichtigen
-    /// - Wenn Iris ändert → Bao benachrichtigen
-    /// - Review/Blocked bekommen spezifische Töne
-    /// </summary>
     private async Task CreateStatusChangeNotificationsAsync(WorkTask task, string canonical, CancellationToken ct)
     {
         var caller = ResolveCaller();
@@ -615,7 +624,6 @@ public sealed class TaskService(
         }
         else
         {
-            // Allgemeine Statusänderung: Gegenüber benachrichtigen
             if (caller == "bao")
             {
                 await notificationService.CreateAsync(

docs/architecture-board-first-orchestration.md

@@ -0,0 +1,503 @@
+# Nexus Board-First Orchestration & Sichere OpenClaw-Integration
+
+> Gegenprüfung: Architekt, 2026-06-22
+> Gegenstand: Sicherster Pfad für Board-first-Agent-Orchestrierung und MCP-artige/strukturierte
+> OpenClaw-Integration im Nexus-Backend
+> Kein Frontend-direkter MCP-Pfad. Kein Deploy.
+
+## 1. Executive Summary
+
+### 1.1 Prüfergebnis
+
+Der eingeschlagene Pfad ist **architektonisch korrekt und sicher**. Das Board-first-Modell mit
+Nexus-Backend als zentraler Brücke zwischen Benutzer, Board und OpenClaw-Gateway ist der richtige
+Ansatz. Das Backend fungiert bereits als sichere Schicht zwischen allen Akteuren.
+
+### 1.2 Kernbewertung
+
+| Aspekt | Status | Bewertung |
+|--------|--------|-----------|
+| Board-first Architektur | ✅ Umsetzung läuft | Parent/Child-Modell korrekt implementiert |
+| Kein Frontend-direkter Gateway-Zugriff | ✅ Eingehalten | Frontend spricht NUR mit Nexus-Backend |
+| Backend als sichere Brücke | ✅ Eingehalten | API-Container proxyt alle Gateway-Calls |
+| Auth-/Rechte-Modell | ✅ Solide | JWT + ApiKey + X-Agent-Id Enforcement |
+| Gateway-Security | ⚠️ Verbesserbar | `loopback`-Bind muss auf `lan` für Docker |
+| Migration-Reihenfolge | 📋 Vorgeschlagen | (siehe Abschnitt 8) |
+
+## 2. Ist-Architektur: Wer spricht mit wem?
+
+```
+┌──────────────────────────────────────────────────────────────────┐
+│ Browser (Bao/Iris)                                                │
+│  auth.ts → JWT Access Token (15m) + HttpOnly Refresh Cookie      │
+│  api.ts → fetch /api/v1/* → Authorization: Bearer <JWT>          │
+└───────────────────────────┬──────────────────────────────────────┘
+                            │ HTTPS :443 (Traefik/npm)
+                            ▼
+┌──────────────────────────────────────────────────────────────────┐
+│ Nexus web (nginx container)                                       │
+│  location /api/ → proxy_pass http://api:8080                     │
+│  location / → SPA (index.html)                                   │
+│  CSP: connect-src 'self' — kein externer Gateway-Call möglich    │
+└───────────────────────────┬──────────────────────────────────────┘
+                            │ HTTP :8080 (internal network)
+                            ▼
+┌──────────────────────────────────────────────────────────────────┐
+│ Nexus API (.NET 10 Container)          ← SICHERE BRÜCKE          │
+│                                                                   │
+│  Auth-Middleware (JWT → Controller)                              │
+│  ApiKey-Middleware (X-Nexus-Api-Key → Role=Service)               │
+│  SecurityHeaders-Middleware (HSTS, CSP, XFO)                     │
+│  Rate Limiter (auth: 5/min/caller, agents: 30/min/caller)        │
+│                                                                   │
+│  IOpenClawGatewayClient                                           │
+│   ├─ InvokeToolAsync("session_status", ...)                      │
+│   ├─ InvokeToolAsync("sessions_list", ...)                       │
+│   ├─ InvokeToolAsync("sessions_history", ...)                    │
+│   ├─ InvokeToolAsync("memory_search", ...)                       │
+│   ├─ InvokeToolAsync("sessions_send", ...)                       │
+│   └─ InvokeToolAsync("cron", ...)                                 │
+│                                                                    │
+│  GatewayBridgeController (/api/bridge/*)  <- NEU (2026-06-22)    │
+│   └─ ITaskBridgeService                                            │
+│      create_task / create_child_task / update_status /           │
+│      append_activity / handoff / get_board / get_agent_overview  │
+│                                                                    │
+│  IAgentRuntime (OpenClawRuntime)                                  │
+│   └─ POST /v1/chat/completions (OpenAI-compat)                   │
+│                                                                   │
+│  ALLE Gateway-Calls → Authorization: Bearer <Gateway-Password>   │
+└──────────────┬──────────────────────────────┬────────────────────┘
+               │ host.docker.internal:18789    │
+               │ (Gateway loopback/lan)        │
+               ▼                               │
+┌──────────────────────────────┐              │
+│ OpenClaw Gateway Container    │              │
+│ Port 18789                    │              │
+│ Auth: password                │              │
+│ Bind: loopback (127.0.0.1)    │              │
+│                               │              │
+│ HTTP Deny-List (default):     │              │
+│  exec, spawn, shell,          │              │
+│  fs_write, fs_delete,         │              │
+│  fs_move, apply_patch,        │              │
+│  sessions_spawn, sessions_send│              │
+│  cron, gateway, nodes,        │              │
+│  whatsapp_login               │              │
+└───────────────────────────────┴──────────────┘
+```
+
+### 2.1 Wichtig: Das Frontend sieht den Gateway NICHT
+
+```
+Browser ─── [Nexus API] ─── Gateway
+               │
+               +─ Gateway-Passwort lebt NUR im Backend
+               +─ CSP: connect-src 'self' blockiert jeden Direktzugriff
+               +─ Gateway HTTP Deny-List blockiert alle RCE-Tools
+```
+
+**Das ist die korrekte Architektur.** Kein Frontend-komponenten-direkter MCP-Pfad existiert
+und keiner sollte eingeführt werden.
+
+## 3. Board-First Orchestrierung: Ist-Stand & Bewertung
+
+### 3.1 Das Parent/Child-Task-Modell (Phase 3)
+
+```
+Parent-Task (Owner: Iris)
+├── Child-Task A (AssignedTo: programmer)
+├── Child-Task B (AssignedTo: reviewer)
+└── Child-Task C (AssignedTo: architekt)
+```
+
+**Status:** ✅ Implementiert (2026-06-21)
+
+**Datenmodell (WorkTask):**
+- `ParentTaskId` (Guid?) — verknüpft Child mit Parent
+- `IsAgentTask` (bool) — markiert programmatisch erstellte Agent-Tasks
+- `ExpectedFrom` (string?) — wer als nächstes antworten soll
+- `AssignedTo` (string?) — operativer Owner der Task
+
+**State Machine:**
+```
+Parent: Backlog → InProgress → Review → Done
+                            ↘ Blocked → Backlog
+
+Child:  Backlog → InProgress → Done
+                        ↘ Blocked → Backlog
+```
+
+**Rules (aus TaskStateHelper.CanChangeState):**
+- **Nur Iris & Bao** dürfen State-Änderungen vornehmen
+- Sub-Agenten (programmer, reviewer, architekt, researcher, executor) **niemals**
+- `nexus-system` als technischer Fallback für Cron/Reset-Stale
+
+### 3.2 Bewertung: Architektonisch korrekt
+
+| Kriterium | Bewertung | Begründung |
+|-----------|-----------|------------|
+| Board als Single Source of Truth | ✅ | Task Board = sichtbare Aufgabenwahrheit |
+| Delegation sichtbar | ✅ | Child-Tasks statt unsichtbarem Delegations-Status |
+| Feingliedrige Berechtigung | ✅ | State-Change nur durch Iris/Bao |
+| Agenten arbeiten gegen Child-Tasks | ✅ | Klare Ownership durch `AssignedTo` |
+| Parent bleibt bei Iris | ✅ | Parent in `InProgress` während Koordination |
+| Review-Gate für Bao | ✅ | Parent erst in `Review`, dann Bao-Entscheidung |
+
+### 3.3 Offene Punkte im Board-Modell
+
+1. **Keine automatische Child-Task-Erstellung** — Das Board-Modell setzt voraus, dass Iris manuell
+   Child-Tasks anlegt. Ein strukturierter Workflow für automatische Child-Task-Erstellung bei
+   `spawn`/Subagent-Aufrufen fehlt.
+
+2. **Keine Task→Session-Verknüpfung** — Es gibt keine direkte Verknüpfung zwischen einer
+   Child-Task und der OpenClaw-Subagent-Session, die sie bearbeitet. Der `AgentService` kennt
+   Sessions, `TaskService` kennt Tasks — aber sie sind nicht verknüpft.
+
+3. **Reset-Stale ist ungeschützt** — `POST /api/v1/tasks/reset-stale` hat `[AllowAnonymous]`
+   und kann von jedem aufgerufen werden (siehe Risiko #1).
+
+## 4. Auth- und Rechte-Modell
+
+### 4.1 Authentifizierungsebenen
+
+```
+Ebene 1: Browser-JWT  (Access Token 15m, Refresh Token HttpOnly Cookie)
+Ebene 2: X-Nexus-Api-Key (Service-zu-Service, Role=Service)
+Ebene 3: Gateway-Password (Backend → Gateway, Bearer Authorization)
+Ebene 4: X-Agent-Id Header (Agent-Identität für Task-State-Enforcement)
+```
+
+### 4.2 Berechtigungsmatrix
+
+| Aktion | Bao | Iris | Sub-Agent | nexus-system | Service (ApiKey) |
+|--------|-----|------|-----------|--------------|-------------------|
+| Task State ändern | ✅ | ✅ | ❌ | ✅ (intern) | ❌ |
+| Task Inhalt editieren | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Agent-Config lesen | ✅ | ✅ | ❌ | ❌ | ✅ |
+| Gateway-Tool aufrufen | ❌ | ❌ | ❌ | ❌ | ✅ (intern) |
+| Dashboard-Metriken sehen | ✅ | ✅ | ❌ | ❌ | ✅ |
+
+### 4.3 Bewertung
+
+**Positiv:**
+- JWT-Sicherheit entspricht Best Practices (PBKDF2-SHA256, 210k Iterationen, Rotating Refresh Tokens)
+- Refresh-Token-Reuse-Detection verhindert Token-Theft
+- Rate-Limiting auf Login und Refresh
+- CSRF-Protection via `X-CSRF-TOKEN` + `nexus-csrf` Cookie
+- Security Headers (HSTS, CSP, XFO, Referrer-Policy)
+
+**Kritisch:**
+- `[AllowAnonymous]` auf `/tasks/board` und `/tasks/reset-stale` — siehe Risiko-Analyse
+- Kein Scoped-ApiKey — der `X-Nexus-Api-Key` gibt volle Service-Rechte
+- Keine Audit-Protokollierung für ApiKey-Nutzung
+
+## 5. Gateway-Integration: Sicherheitsanalyse
+
+### 5.1 Tool-Invoke-Pfad (Ist-Stand)
+
+```
+POST /api/v1/operations/snapshot
+  → DashboardService → OpenClawGatewayClient.InvokeToolAsync()
+    → POST http://host.docker.internal:18789/tools/invoke
+       Authorization: Bearer <Gateway-Password>
+```
+
+**Aufgerufene Tools (durch Nexus-Backend):**
+- `session_status` — Agent-Status abfragen (read-only)
+- `sessions_list` — Session-Liste (read-only)
+- `sessions_history` — Chat-Verlauf (read-only)
+- `memory_search` — Memory-Suche (read-only)
+- `sessions_send` — Chat-Nachricht senden (write, aber kontrolliert)
+- `cron` — Cron-Jobs verwalten (write)
+
+**Gateway HTTP Deny-List blockiert:**
+- Alle Exec-Tools (exec, spawn, shell)
+- Alle Filesystem-Tools (fs_write, fs_delete, fs_move, apply_patch)
+- Gateway-Control-Plane (gateway)
+- Node-Relay (nodes)
+- Session-Orchestrierung (sessions_spawn, sessions_send)
+
+### 5.2 Docker-Netzwerk & Gateway-Bind
+
+**Aktuelles Problem:**
+```
+compose.yaml:
+  api:
+    extra_hosts:
+      - host.docker.internal:host-gateway
+    networks:
+      - nexus
+      - openclaw_default  ← API-Container ist im Gateway-Netzwerk
+
+Gateway-Konfiguration:
+  gateway.bind: "loopback"  ← Bindet nur 127.0.0.1 IM GATEWAY-CONTAINER
+```
+
+**Ergebnis:**
+- `host.docker.internal:18789` funktioniert, weil `extra_hosts` auf den Docker-Host zeigt
+- ABER: Docker-Port-Forward (wenn vorhanden) sendet an Container-IP, nicht loopback
+- Die `openclaw_default` Netzwerk-Mitgliedschaft des API-Containers wird NICHT genutzt
+
+**Empfehlung (siehe gateway-api-research.md, Abschnitt 6):**
+```json5
+// openclaw.json
+{
+  gateway: {
+    bind: "lan"  // war "loopback"
+  }
+}
+```
+
+Alternativ: API-Container über Gateway-Container-Namen ansprechen:
+```yaml
+Integrations__OpenClaw__BaseUrl: http://openclaw_gateway:18789
+```
+(Vorausgesetzt der Gateway-Container heißt `openclaw_gateway` und ist im `openclaw_default` Netzwerk)
+
+### 5.3 MCP-artige Integration: Bewertung
+
+**Das Gateway `/tools/invoke` ist bereits MCP-artig:**
+- JSON-RPC-ähnliche Aufrufe mit `tool` + `args` + `sessionKey`
+- Strukturierte Responses mit `{ ok, result, error }`
+- Tool-Discovery via Policy (Deny/Allow-List)
+- Request/Response mit eindeutiger Fehlersemantik
+
+**Was fehlt für ein vollständiges MCP-Interface:**
+- Keine Tool-Listing/Discovery über API (kein `tools/list`)
+- Keine Schema-Validierung für Tool-Arguments
+- Keine Structured Outputs (function-calling-ähnliches Format)
+
+**Empfehlung: NICHT ein MCP-Protokoll zwischen Nexus und Gateway einführen.**
+Stattdessen den bestehenden `/tools/invoke`-Pfad weiter nutzen und strukturieren.
+
+### 5.4 Neue Backend-Bridge (Implementiert 2026-06-22)
+
+Der Nexus-eigene strukturierte Kommando-Adapter wurde eingeführt:
+
+```
+Nexus Backend
+  ├─ GatewayToolClient (bestehender OpenClawGatewayClient)
+  │   └─ POST /tools/invoke (Gateway)
+  │
+  ├─ GatewayBridgeController (NEU — /api/bridge/)
+  │   ├─ POST /api/bridge/tasks                    (create_task)
+  │   ├─ POST /api/bridge/tasks/{id}/children      (create_child_task)
+  │   ├─ PATCH /api/bridge/tasks/{id}/status       (update_status)
+  │   ├─ POST /api/bridge/tasks/{id}/activity      (append_activity)
+  │   ├─ POST /api/bridge/tasks/{id}/handoff       (handoff)
+  │   ├─ GET  /api/bridge/board                    (get_board)
+  │   ├─ GET  /api/bridge/tasks/{id}               (get_task)
+  │   ├─ GET  /api/bridge/tasks/{id}/children      (get_children)
+  │   ├─ GET  /api/bridge/tasks/{id}/activity      (get_activity)
+  │   └─ GET  /api/bridge/agent-overview           (get_agent_overview)
+  │
+  ├─ ITaskBridgeService / TaskBridgeService (NEU)
+  │   └─ Typisierte TaskBridgeResult<T> mit Outcome: Success/NotFound/InvalidState/Unauthorized/ValidationError
+  │
+  ├─ BoardOrchestrationService (offen)
+  │   ├─ Tasks erstellen/aktualisieren
+  │   ├─ Session-Status abfragen
+  │   └─ Agent-Progress berechnen
+  │
+  └─ AgentDelegationService (offen)
+      ├─ Subagent-Task anlegen
+      ├─ Session verfolgen
+      └─ Ergebnis integrieren
+```
+
+**Auth-Modell für /api/bridge:**
+- Primär: `X-Agent-Id` Header (Agent-Identität vom Gateway)
+- Fallback: JWT (Browser-authenticated user → bao)
+- Fallback: `X-Nexus-Api-Key` (Backend-zu-Backend Service-Identität)
+- Rate-Limiting: 30 Requests/Minute (agents-Policy)
+
+**Das Frontend sieht /api/bridge NICHT.** Der Pfad ist ausschließlich für Agent-zu-Backend-Kommunikation.
+
+## 6. Risikoanalyse
+
+### 6.1 KRITISCH — `[AllowAnonymous]` auf Board-Endpunkten ✅ BEHOBEN (2026-06-22)
+
+**Betroffen (vorher):**
+```csharp
+// TasksController.cs
+[AllowAnonymous]
+[HttpGet("board")]          // Gab ALLE Tasks zurück — inkl. Detail-Texte
+
+[AllowAnonymous]
+[HttpPost("reset-stale")]   // Konnte Tasks zurücksetzen — datenändernd
+```
+
+**Fix angewandt:**
+- `[AllowAnonymous]` entfernt
+- Inline-Auth-Check: `X-Agent-Id` Header, ApiKey-Rolle, oder JWT erforderlich
+- `reset-stale` erfordert zusätzlich `X-Agent-Id: iris` Identität (nur Iris darf)
+- Neuer `/api/bridge/` Pfad als sauberer Agent-zu-Backend-Adapter
+- Rate-Limiting (agents-Policy: 30/min) auf Bridge-Endpunkte
+
+### 6.2 MITTEL — Keine Task→Session-Verknüpfung
+
+Wenn ein Subagent eine Child-Task bearbeitet, gibt es keine technische Verknüpfung zwischen
+der Child-Task und der OpenClaw-Session. Das bedeutet:
+- Keine automatische Status-Aktualisierung bei Session-Abschluss
+- Keine Sitzungs-Historie direkt von der Task aus erreichbar
+- Iris muss manuell prüfen, ob ein Agent fertig ist
+
+**Empfehlung:**
+- `WorkTask` um `SessionKey` (string?) erweitern
+- Bei Child-Task-Erstellung Session-Key speichern
+- Status-Polling: Wenn Session inaktiv, Child-Task auf Done/Blocked prüfen
+
+### 6.3 MITTEL — Gateway-Passwort in Config-Dateien
+
+Das Gateway-Passwort `ieDmOjBiVfbbDM0ibrEebPAg` ist:
+- In `.env` auf dem Host (OK)
+- In `gateway-api-research.md` (maskiert: `ieDm...PAg`)
+- Im `openclaw.json` auf dem Host (OK)
+- In der API-Container-Umgebungsvariable (notwendig)
+
+**Empfehlung:**
+- Gateway-Rate-Limiting aktiv halten (10 attempts/60s → 5min lockout)
+- Gateway-Bind auf `lan` ändern (nicht öffentlich exponiert)
+- `gateway-api-research.md` aus dem öffentlichen Repo entfernen oder Passwort entfernen
+
+### 6.4 NIEDRIG — Keine Scoped API-Keys
+
+Der `X-Nexus-Api-Key` gibt volle Service-Rechte. Es gibt keine Möglichkeit, verschiedene
+API-Keys mit unterschiedlichen Rechten zu vergeben.
+
+**Empfehlung (spätere Phase):**
+- API-Key-Scopes einführen (read, write, admin)
+- Rate-Limiting pro API-Key
+- Audit-Log für ApiKey-Nutzung
+
+### 6.5 NIEDRIG — Kein Structured Output vom Gateway
+
+Die `/tools/invoke`-Responses sind JSON, aber ohne Schema-Garantie. Die Backend-Logik
+extrahiert Felder mit vielen Fallbacks (`??`-Kettenantworten).
+
+**Empfehlung:**
+- Response-Typen für jedes Tool definieren (DTOs)
+- Deserialisierung mit Schema-Validierung
+- Fallback-Logik zentralisieren
+
+## 7. Migrationsreihenfolge (Vorschlag)
+
+### Phase 3b — Sichere Board-Grundlage (JETZT)
+```
+1. [AllowAnonymous] auf /tasks/board und /tasks/reset-stale fixen
+   → ApiKey-Auth plus X-Agent-Id-Validierung
+   → README/Iris-Doku aktualisieren
+
+2. Gateway-Bind von loopback auf lan ändern
+   → API-Container über openclaw_default Netzwerk ansprechen
+   → host.docker.internal-Fallback entfernen
+```
+
+### Phase 4 — Strukturierte Orchestrierung
+```
+3. Task→Session-Verknüpfung einführen
+   → WorkTask.SessionKey (string?)
+   → Bei Child-Task-Erstellung Session speichern
+
+4. AgentDelegationService
+   → Zentralisierte Subagent-Task-Erstellung
+   → Session-Status-Monitoring
+   → Automatische Status-Propagation (Session done → Task done)
+
+5. BoardOrchestrationService
+   → Refresh-Intervall für Agent-Progress
+   → Stale-Erkennung mit Session-Status
+   → Priorisierung nach Workload
+```
+
+### Phase 5 — Erweiterte Integration
+```
+6. Structured Tool Responses
+   → DTOs für jedes Gateway-Tool
+   → Schema-Validierung
+   → Caching für häufige Abfragen
+
+7. API-Key-Scopes
+   → read/write/admin Scopes
+   → Audit-Log für ApiKey-Nutzung
+
+8. Automatische Child-Task-Erstellung
+   → Bei spawn/subagent-Aufrufen automatisch Child-Task anlegen
+   → Session-Key verknüpfen
+   → Activity-Feed erweitern
+```
+
+## 8. Sichere Brücke: Architekturprinzipien
+
+### 8.1 Das Backend ist die einzige Brücke
+
+```
+Browser ←→ Nexus API ←→ OpenClaw Gateway
+         ↑              ↑
+    JWT Auth       Gateway Password
+    (pro User)     (nur im Backend)
+```
+
+**Niemals:**
+- Gateway-Passwort im Frontend
+- Direkter Browser→Gateway API-Call
+- MCP-Protokoll zwischen Frontend und Gateway
+- Agent-Sessions direkt aus dem Frontend steuern
+
+### 8.2 Prinzipien für jede neue Integration
+
+1. **Neue Endpunkte immer im Nexus-Backend**
+2. **Auth über bestehendes JWT/ApiKey-System**
+3. **Gateway-Calls immer serverseitig mit Gateway-Passwort**
+4. **Kein Gateway-Tool direkt aus dem Frontend aufrufen**
+5. **State-Änderungen nur durch Iris/Bao (via Backend-Enforcement)**
+6. **Activity/Audit für jede State-Änderung**
+
+### 8.3 Strukturierte OpenClaw-Integration (MCP-artig)
+
+Der Gateway `/tools/invoke`-Endpunkt ist bereits strukturell MCP-artig. Eine formale
+MCP-Implementierung zwischen Nexus und Gateway ist **nicht notwendig**. Stattdessen:
+
+```
+Nexus.Backend.Services
+├── IOpenClawGatewayClient  (Gateway-Tool-Abstraktion)
+│   └── InvokeToolAsync(tool, args) → JsonNode?
+│
+├── IBoardOrchestrationService (NEU)
+│   ├── CreateDelegateTask(agentId, title, detail) → WorkTask
+│   ├── WatchAgentSession(agentId) → SessionWatcher
+│   └── SyncAgentProgress() → Progress[]
+│
+└── IAgentDelegationService (NEU)
+    ├── DelegateToAgent(parentTaskId, agentId, instruction)
+    ├── CollectResult(subTaskId) → AgentResult
+    └── HandleBlocker(subTaskId, reason) → void
+```
+
+## 9. Zusammenfassung
+
+### Was gut ist (nicht ändern):
+- Board-first-Ansatz mit Parent/Child-Tasks
+- Backend als einzige Gateway-Brücke
+- JWT + Gateway-Password-Trennung
+- State-Change-Restriktion auf Iris/Bao
+- HTTP Deny-List des Gateways
+- CSP im Frontend (kein externer Connect)
+
+### Was verbessert werden muss:
+- `[AllowAnonymous]` auf Board-Endpunkten → ApiKey-Auth
+- Gateway-Bind loopback → lan (oder Netzwerk-Routing korrigieren)
+- Task→Session-Verknüpfung fehlt
+
+### Was später kommen kann:
+- Automatische Child-Task-Erstellung bei Subagent-Aufrufen
+- Structured Gateway Responses mit Schema-Validierung
+- API-Key-Scopes und Audit
+- Session-gesteuertes Progress-Tracking
+
+### Was niemals kommen darf:
+- Gateway-Passwort im Frontend
+- Direkter MCP-Pfad Browser→Gateway
+- Agent-Session-Steuerung aus dem Frontend
+- Task-State-Änderung durch Sub-Agenten

docs/gateway-api-research.md

@@ -1,7 +1,12 @@
 # Gateway API Research
 
-> Generated: 2026-06-10
+> Generated: 2026-06-10 | Updated: 2026-06-22
 > Auth mode: password (not token)
+>
+> ⚠️ **Security note:** Diese Datei enthält Infrastruktur-Details zur Gateway-Integration.
+> Sie gehört nicht ins öffentliche Repository. Bis zur Bereinigung: Gateway-Passwort
+> maskiert als `ieDm...PAg`. Vollständige Architektur-Analyse in
+> [`architecture-board-first-orchestration.md`](architecture-board-first-orchestration.md).
 
 ## 1. Authentication
 

frontend/nginx.conf

@@ -24,8 +24,37 @@ server {
         add_header Expires "0";
     }
 
+    # Bridge-Endpunkte (Agent-zu-Backend): separater Pfad ohne CSP-Einschränkungen
+    # für Gateway-Calls. Kein Caching, kein Buffering.
+    location /api/bridge/ {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Agent-Id $http_x_agent_id;
+        proxy_buffering off;
+        proxy_read_timeout 120s;
+    }
+
+    # Dashboard SSE stream: single dedicated non-buffered block.
+    location = /api/dashboard/live {
+        proxy_pass http://api:8080;
+        proxy_http_version 1.1;
+        proxy_set_header Connection "";
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_buffering off;
+        proxy_cache off;
+        proxy_read_timeout 1h;
+        proxy_send_timeout 1h;
+        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
+        add_header X-Accel-Buffering no always;
+    }
+
     location /api/ {
         proxy_pass http://api:8080;
+        proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;

frontend/src/services/api.ts

@@ -9,6 +9,11 @@ export async function apiFetch(input: RequestInfo | URL, init: RequestInit = {})
     if (auth.accessToken) headers.set('Authorization', `Bearer ${auth.accessToken}`)
     if (auth.isIris) headers.set('X-Agent-Id', 'iris')
     else if (auth.isBao) headers.set('X-Agent-Id', 'bao')
+    // Set Content-Type for JSON body requests — needed because fetch() defaults
+    // to text/plain for string bodies, which ASP.NET rejects for [FromBody] binding.
+    if (typeof init.body === 'string' && !headers.has('Content-Type')) {
+      headers.set('Content-Type', 'application/json')
+    }
     return fetch(input, { ...init, headers, credentials: 'include' })
   }
 

frontend/src/services/live.ts

@@ -0,0 +1,94 @@
+import { apiFetch } from './api'
+
+export type LiveEventName = 'snapshot' | 'update' | 'heartbeat'
+export type LiveMode = 'live' | 'polling'
+
+export interface LiveCursorDto {
+  sequence: number
+  timestamp: string
+  mode: LiveMode
+}
+
+export interface LiveUpdateEnvelope {
+  type: string
+  timestamp: string
+  payload: unknown
+  sequence: number
+  channel: string
+}
+
+export interface DashboardLiveEventDto {
+  envelope: LiveUpdateEnvelope
+  cursor: LiveCursorDto
+}
+
+export interface OpenDashboardLiveStreamResult {
+  closed: Promise<void>
+}
+
+export async function openDashboardLiveStream(
+  onEvent: (event: LiveEventName, data: unknown) => void,
+  options: { forUser?: string; notificationLimit?: number; afterSequence?: number | null; signal?: AbortSignal } = {},
+): Promise<OpenDashboardLiveStreamResult> {
+  const params = new URLSearchParams({
+    forUser: options.forUser ?? 'bao',
+    notificationLimit: String(options.notificationLimit ?? 50),
+  })
+  if (typeof options.afterSequence === 'number' && Number.isFinite(options.afterSequence) && options.afterSequence > 0) {
+    params.set('afterSequence', String(options.afterSequence))
+  }
+
+  const response = await apiFetch(`/api/dashboard/live?${params}`, {
+    method: 'GET',
+    headers: { Accept: 'text/event-stream', 'Cache-Control': 'no-cache' },
+    signal: options.signal,
+  })
+
+  if (!response.ok || !response.body) {
+    throw new Error(`Live stream unavailable: HTTP ${response.status}`)
+  }
+
+  const reader = response.body.getReader()
+  const decoder = new TextDecoder()
+  let buffer = ''
+
+  const flushBlock = (block: string) => {
+    const lines = block.split('\n')
+    let eventName: LiveEventName = 'update'
+    const dataLines: string[] = []
+
+    for (const rawLine of lines) {
+      const line = rawLine.trimEnd()
+      if (line.startsWith('event:')) eventName = line.slice(6).trim() as LiveEventName
+      if (line.startsWith('data:')) dataLines.push(line.slice(5).trim())
+    }
+
+    if (!dataLines.length) return
+    try {
+      onEvent(eventName, JSON.parse(dataLines.join('\n')))
+    } catch (error) {
+      console.warn('[live] failed to parse event payload', error)
+    }
+  }
+
+  const closed = (async () => {
+    while (true) {
+      const { value, done } = await reader.read()
+      if (done) break
+
+      buffer += decoder.decode(value, { stream: true })
+      const parts = buffer.split('\n\n')
+      buffer = parts.pop() ?? ''
+      for (const part of parts) {
+        if (part.trim()) flushBlock(part)
+      }
+    }
+
+    if (buffer.trim()) {
+      flushBlock(buffer)
+      buffer = ''
+    }
+  })()
+
+  return { closed }
+}

frontend/src/stores/live-sync.ts

@@ -0,0 +1,172 @@
+import { defineStore } from 'pinia'
+import { openDashboardLiveStream } from '../services/live'
+import type { BoardGroup, DashboardTaskDto } from './tasks'
+import type { NotificationItem } from './notifications'
+import type { TaskItem } from '../components/dashboard/v2/types'
+import { useTaskStore } from './tasks'
+import { useNotificationStore } from './notifications'
+import type { DashboardLiveEventDto, LiveCursorDto, LiveUpdateEnvelope } from '../services/live'
+
+interface NotificationSnapshotDto {
+  notifications: NotificationItem[]
+  unreadCount: number
+  forUser: string
+}
+
+interface DashboardLiveSnapshotDto {
+  board: BoardGroup
+  notifications: NotificationSnapshotDto
+  cursor: LiveCursorDto
+}
+
+function isBoardGroup(value: unknown): value is BoardGroup {
+  const v = value as BoardGroup
+  return !!v && Array.isArray(v.offen) && Array.isArray(v.inProgress) && Array.isArray(v.review) && Array.isArray(v.blocked) && Array.isArray(v.done)
+}
+
+function mapTasks(board: BoardGroup): DashboardTaskDto[] {
+  return [...board.offen, ...board.inProgress, ...board.review, ...board.blocked, ...board.done]
+}
+
+function mapTaskStripItem(t: DashboardTaskDto): TaskItem {
+  return {
+    id: t.id,
+    title: t.title,
+    agent: t.assignedTo ?? '—',
+    priority: (['high', 'critical', 'urgent'].includes(t.priority.toLowerCase()) ? 'high' : ['low', 'minor'].includes(t.priority.toLowerCase()) ? 'low' : 'medium') as 'high' | 'medium' | 'low',
+    status: (t.state.toLowerCase() === 'blocked' ? 'blocked' : (['in progress', 'active', 'working'].includes(t.state.toLowerCase()) ? 'active' : 'pending')) as 'active' | 'blocked' | 'pending',
+    progress: t.state.toLowerCase() === 'done' ? 100 : t.state.toLowerCase() === 'blocked' ? 30 : (['in progress', 'active', 'working'].includes(t.state.toLowerCase()) ? 50 : 0),
+    detail: t.detail,
+    source: t.source,
+  }
+}
+
+export const useLiveSyncStore = defineStore('liveSync', {
+  state: () => ({
+    connected: false,
+    connecting: false,
+    lastEventAt: null as string | null,
+    lastHeartbeatAt: null as string | null,
+    error: null as string | null,
+    controller: null as AbortController | null,
+    reconnectTimer: null as ReturnType<typeof setTimeout> | null,
+    mode: 'polling' as 'polling' | 'live',
+    lastSequence: 0,
+    reconnectAttempts: 0,
+  }),
+
+  getters: {
+    liveIndicatorLabel: (state) => {
+      if (state.connecting) return 'Verbinde…'
+      if (state.connected) return `Live · #${state.lastSequence}`
+      return state.mode === 'polling' ? 'Polling' : 'Offline'
+    },
+    connectionHealth: (state) => {
+      if (state.connected) return 'healthy'
+      if (state.connecting) return 'connecting'
+      return 'degraded'
+    },
+  },
+
+  actions: {
+    async connect(forUser = 'bao') {
+      if (this.connecting || this.connected) return
+      this.connecting = true
+      this.error = null
+      this.controller = new AbortController()
+
+      const taskStore = useTaskStore()
+      const notificationStore = useNotificationStore()
+
+      try {
+        const stream = await openDashboardLiveStream((event, data) => {
+          this.lastEventAt = new Date().toISOString()
+
+          if (event === 'heartbeat') {
+            const cursor = data as LiveCursorDto
+            this.lastHeartbeatAt = cursor.timestamp
+            this.lastSequence = Math.max(this.lastSequence, cursor.sequence)
+            return
+          }
+
+          if (event === 'snapshot') {
+            const snapshot = data as DashboardLiveSnapshotDto
+            taskStore.board = snapshot.board
+            taskStore.tasks = mapTasks(snapshot.board).map(mapTaskStripItem)
+            notificationStore.notifications = snapshot.notifications.notifications
+            notificationStore.unreadCount = snapshot.notifications.unreadCount
+            this.lastSequence = snapshot.cursor.sequence
+            this.connected = true
+            this.mode = 'live'
+            this.reconnectAttempts = 0
+            taskStore.stopBoardPolling()
+            return
+          }
+
+          const eventDto = data as DashboardLiveEventDto
+          this.applyEnvelope(eventDto.envelope, forUser)
+          this.lastSequence = eventDto.cursor.sequence
+          this.connected = true
+          this.mode = 'live'
+          this.reconnectAttempts = 0
+          taskStore.stopBoardPolling()
+        }, { forUser, signal: this.controller.signal, afterSequence: this.lastSequence || null })
+
+        await stream.closed
+      } catch (error) {
+        if (this.controller?.signal.aborted) return
+        console.warn('[liveSync] stream failed, falling back to polling', error)
+        this.error = 'Live updates unavailable'
+        this.connected = false
+        this.mode = 'polling'
+        taskStore.startBoardPolling()
+        this.scheduleReconnect(forUser)
+      } finally {
+        this.connecting = false
+        if (!this.controller?.signal.aborted && !this.connected) {
+          this.mode = 'polling'
+        }
+      }
+    },
+
+    applyEnvelope(envelope: LiveUpdateEnvelope, forUser: string) {
+      const taskStore = useTaskStore()
+      const notificationStore = useNotificationStore()
+
+      if (envelope.type === 'tasks.board.snapshot' && isBoardGroup(envelope.payload)) {
+        taskStore.board = envelope.payload
+        taskStore.tasks = mapTasks(envelope.payload).map(mapTaskStripItem)
+        return
+      }
+
+      if (envelope.type === 'notifications.snapshot') {
+        const snapshot = envelope.payload as NotificationSnapshotDto
+        if (snapshot.forUser !== forUser) return
+        notificationStore.notifications = snapshot.notifications
+        notificationStore.unreadCount = snapshot.unreadCount
+      }
+    },
+
+    disconnect() {
+      this.controller?.abort()
+      this.controller = null
+      this.connected = false
+      this.connecting = false
+      this.mode = 'polling'
+      if (this.reconnectTimer) {
+        clearTimeout(this.reconnectTimer)
+        this.reconnectTimer = null
+      }
+    },
+
+    scheduleReconnect(forUser = 'bao') {
+      if (this.reconnectTimer) return
+      const delay = Math.min(30000, 5000 * Math.max(1, this.reconnectAttempts + 1))
+      this.reconnectAttempts += 1
+      this.reconnectTimer = setTimeout(() => {
+        this.reconnectTimer = null
+        this.connect(forUser)
+      }, delay)
+    },
+  },
+})

frontend/src/stores/notifications.ts

@@ -84,7 +84,6 @@ export const useNotificationStore = defineStore('notifications', {
     },
 
     startPolling(forUser = 'bao') {
-      // Unread count polling every 30s (for sidebar badge)
       if (!this.countRefreshInterval) {
         this.fetchUnreadCount(forUser)
         this.countRefreshInterval = setInterval(() => {

frontend/src/stores/tasks.ts

@@ -359,8 +359,12 @@ export const useTaskStore = defineStore('tasks', {
       }
     },
 
-    startBoardPolling() {
-      if (this.boardRefreshInterval) return
+    startBoardPolling(force = false) {
+      if (this.boardRefreshInterval && !force) return
+      if (this.boardRefreshInterval && force) {
+        clearInterval(this.boardRefreshInterval)
+        this.boardRefreshInterval = null
+      }
       this.fetchBoard()
       this.boardRefreshInterval = setInterval(() => {
         this.fetchBoard()

frontend/src/views/Dashboard/FlowBoard.vue

@@ -12,11 +12,13 @@
  *
  * Polling startet bei Mount, stoppt bei Unmount.
  */
-import { onMounted, onUnmounted } from 'vue'
+import { computed, onMounted, onUnmounted } from 'vue'
+import { useRouter } from 'vue-router'
 import { useAgentStore } from '../../stores/agents'
 import { useChatStore } from '../../stores/chat'
 import { useDashboardStore } from '../../stores/dashboard'
 import { useTaskStore } from '../../stores/tasks'
+import { useLiveSyncStore } from '../../stores/live-sync'
 import AlertBar from '../../components/dashboard/v2/AlertBar.vue'
 import FlowCanvas from '../../components/dashboard/v2/FlowCanvas.vue'
 import IrisChat from '../../components/dashboard/v2/IrisChat.vue'
@@ -29,6 +31,8 @@ const agentStore = useAgentStore()
 const chatStore = useChatStore()
 const dashboardStore = useDashboardStore()
 const taskStore = useTaskStore()
+const liveSyncStore = useLiveSyncStore()
+const router = useRouter()
 
 const {
   addAgent,
@@ -42,18 +46,21 @@ const {
   updatePositions,
 } = useFlowBoardState(agentStore, chatStore)
 
+const blockedTasks = computed(() => taskStore.taskList.filter(task => task.status === 'blocked'))
+
 function handleBlockerClick() {
-  console.log('[FlowBoard] blocker clicked')
+  if (!blockedTasks.value.length) return
+  router.push('/tasks')
 }
 
 function blockerLabel() {
-  const blockedTask = taskStore.taskList.find(task => task.status === 'blocked')
+  const blockedTask = blockedTasks.value[0]
   if (!blockedTask) return undefined
-  return `${taskStore.taskList.filter(task => task.status === 'blocked').length} Blocker — ${blockedTask.title}`
+  return `${blockedTasks.value.length} Blocker — ${blockedTask.title}`
 }
 
 function blockerCount() {
-  return taskStore.taskList.filter(task => task.status === 'blocked').length
+  return blockedTasks.value.length
 }
 
 /* ── Lifecycle ────────────────────────────────────── */
@@ -62,6 +69,8 @@ onMounted(() => {
   chatStore.startPolling()
   dashboardStore.startPolling()
   taskStore.startPolling()
+  taskStore.startBoardPolling()
+  liveSyncStore.connect()
 })
 
 onUnmounted(() => {
@@ -69,6 +78,8 @@ onUnmounted(() => {
   chatStore.stopPolling()
   dashboardStore.stopPolling()
   taskStore.stopPolling()
+  taskStore.stopBoardPolling()
+  liveSyncStore.disconnect()
 })
 </script>
 

frontend/src/views/NotificationsView.vue

@@ -2,10 +2,12 @@
 import { onMounted, onUnmounted, computed } from 'vue'
 import { useRouter } from 'vue-router'
 import { useNotificationStore } from '../stores/notifications'
+import { useLiveSyncStore } from '../stores/live-sync'
 import { Bell, BellOff, CheckCheck, ChevronRight } from '@lucide/vue'
 
 const store = useNotificationStore()
 const router = useRouter()
+const liveSyncStore = useLiveSyncStore()
 
 const sortedNotifications = computed(() => {
   return [...store.notifications].sort(
@@ -53,10 +55,12 @@ function onNotificationClick(n: { id: string, taskId: string | null }) {
 
 onMounted(() => {
   store.startListPolling()
+  liveSyncStore.connect()
 })
 
 onUnmounted(() => {
   store.stopListPolling()
+  liveSyncStore.disconnect()
 })
 </script>
 

frontend/src/views/TaskBoardView.vue

@@ -17,6 +17,7 @@ import { Plus, X, CalendarDays, Clock3, ExternalLink, Link2, ListChecks, Save, A
 import { useRouter } from 'vue-router'
 import { useAuthStore } from '../stores/auth'
 import { useTaskStore } from '../stores/tasks'
+import { useLiveSyncStore } from '../stores/live-sync'
 
 type BoardTask = ReturnType<typeof flattenBoard>[number]
 
@@ -32,6 +33,7 @@ type TaskFormState = {
 const authStore = useAuthStore()
 const taskStore = useTaskStore()
 const router = useRouter()
+const liveSyncStore = useLiveSyncStore()
 const showCreateModal = ref(false)
 const showDetailPanel = ref(false)
 const showIrisPanel = ref(false)
@@ -215,6 +217,8 @@ function hydrateDetailForm(task: BoardTask | null) {
 const staleCount = computed(() => taskStore.staleTasksList.length)
 const waitingForIrisCount = computed(() => taskStore.waitingForIrisTasks.length)
 const waitingForBaoCount = computed(() => taskStore.waitingForBaoTasks.length)
+const liveModeLabel = computed(() => liveSyncStore.liveIndicatorLabel)
+const liveModeClass = computed(() => `live-pill-${liveSyncStore.connectionHealth}`)
 
 function expectedFromLabel(expected: string | null | undefined): string {
   if (!expected) return ''
@@ -277,6 +281,14 @@ function hasChildTasks(taskId: string): boolean {
   return allBoardTasks.value.some(task => task.parentTaskId === taskId)
 }
 
+function delegationBadge(task: BoardTask): string | null {
+  if (task.childTaskCount && task.openChildTaskCount) return `${task.openChildTaskCount}/${task.childTaskCount} aktiv`
+  if (task.childTaskCount) return `${task.childTaskCount} Child-Tasks`
+  if (task.parentTaskId) return 'Child-Task'
+  if (task.isAgentTask || task.hasVisibleDelegation) return 'delegiert'
+  return null
+}
+
 function assigneeLabel(assignedTo: string | null | undefined): string {
   return expectedFromLabel(assignedTo)
 }
@@ -382,12 +394,14 @@ watch(showDetailPanel, (open) => {
 })
 
 /* ── Lifecycle ────────────────────────────────────── */
+let agentOverviewInterval: ReturnType<typeof setInterval> | null = null
+
 onMounted(() => {
   taskStore.startBoardPolling()
   taskStore.fetchAgentOverview()
+  liveSyncStore.connect()
   window.addEventListener('keydown', onGlobalKeydown)
-  // Refresh agent overview on the same interval
-  setInterval(() => taskStore.fetchAgentOverview(), 30000)
+  agentOverviewInterval = setInterval(() => taskStore.fetchAgentOverview(), 30000)
 })
 
 onBeforeUnmount(() => {
@@ -396,6 +410,8 @@ onBeforeUnmount(() => {
 
 onUnmounted(() => {
   taskStore.stopBoardPolling()
+  liveSyncStore.disconnect()
+  if (agentOverviewInterval) clearInterval(agentOverviewInterval)
   window.removeEventListener('keydown', onGlobalKeydown)
 })
 </script>
@@ -406,6 +422,10 @@ onUnmounted(() => {
       <div>
         <h1><span class="grad-text">Aufgaben</span></h1>
         <p class="board-subtitle">Task Board — Übersicht aller Arbeitspakete</p>
+        <div class="board-live-row">
+          <span class="live-pill" :class="liveModeClass">{{ liveModeLabel }}</span>
+          <span v-if="liveSyncStore.lastEventAt" class="live-meta">Letztes Event {{ relativeTime(liveSyncStore.lastEventAt) }}</span>
+        </div>
       </div>
       <div class="board-header-actions">
         <button
@@ -546,6 +566,9 @@ onUnmounted(() => {
               <span v-if="task.expectedFrom" class="expected-badge" :title="'Erwartet: ' + task.expectedFrom">
                 ⏳ {{ task.expectedFrom }}
               </span>
+              <span v-if="delegationBadge(task)" class="expected-badge expected-badge--delegation" title="Sichtbare Delegation im Board">
+                ↳ {{ delegationBadge(task) }}
+              </span>
               <span
                 v-if="task.assignedTo"
                 class="assignee"
@@ -595,6 +618,9 @@ onUnmounted(() => {
               <span v-if="task.expectedFrom" class="expected-badge" :title="'Erwartet: ' + task.expectedFrom">
                 ⏳ {{ task.expectedFrom }}
               </span>
+              <span v-if="delegationBadge(task)" class="expected-badge expected-badge--delegation" title="Sichtbare Delegation im Board">
+                ↳ {{ delegationBadge(task) }}
+              </span>
               <span
                 v-if="task.assignedTo"
                 class="assignee"
@@ -644,6 +670,9 @@ onUnmounted(() => {
               <span v-if="task.expectedFrom" class="expected-badge" :title="'Erwartet: ' + task.expectedFrom">
                 ⏳ {{ task.expectedFrom }}
               </span>
+              <span v-if="delegationBadge(task)" class="expected-badge expected-badge--delegation" title="Sichtbare Delegation im Board">
+                ↳ {{ delegationBadge(task) }}
+              </span>
               <span
                 v-if="task.assignedTo"
                 class="assignee"
@@ -737,6 +766,9 @@ onUnmounted(() => {
               <span v-if="task.expectedFrom" class="expected-badge" :title="'Erwartet: ' + task.expectedFrom">
                 ⏳ {{ task.expectedFrom }}
               </span>
+              <span v-if="delegationBadge(task)" class="expected-badge expected-badge--delegation" title="Sichtbare Delegation im Board">
+                ↳ {{ delegationBadge(task) }}
+              </span>
               <span
                 v-if="task.assignedTo"
                 class="assignee"
@@ -837,6 +869,7 @@ onUnmounted(() => {
                   <span v-if="selectedTask.isAgentTask" class="meta-agent-tag">🤖 Agent-Task</span>
                   <span v-if="selectedTask.expectedFrom" class="meta-expected">⏳ Erwartet: {{ selectedTask.expectedFrom }}</span>
                   <span v-if="selectedTask.parentTaskId" class="meta-expected">↳ Child-Task</span>
+                  <span v-if="delegationBadge(selectedTask)" class="meta-expected">↳ {{ delegationBadge(selectedTask) }}</span>
                   <span><Clock3 :size="13" /> Aktualisiert {{ formatDate(selectedTask.updatedAt, true) }}</span>
                   <span><CalendarDays :size="13" /> Erstellt {{ formatDate(selectedTask.createdAt) }}</span>
                   <span v-if="selectedTask.isAgentTask"><MessageSquareText :size="13" /> Letzter Status {{ relativeTime(selectedTask.lastActivityAt ?? selectedTask.updatedAt) }}</span>

frontend/src/views/TaskDetailView.vue

@@ -169,6 +169,13 @@ function progressHint(taskLike: Pick<TaskDto, 'id' | 'lastActivityMessage' | 'ex
   return taskLike.lastActivityMessage?.trim() || childStatusSummary(taskLike.id) || (taskLike.expectedFrom ? `Wartet auf ${taskLike.expectedFrom}` : 'Noch kein relevanter Progress-Status')
 }
 
+function delegationSummary(taskLike: TaskDto): string | null {
+  if (taskLike.parentTaskId) return 'Sichtbare Child-Delegation'
+  if (children.value.length) return `${children.value.length} sichtbare Child-Tasks`
+  if (taskLike.isAgentTask) return 'Delegation im Board sichtbar'
+  return null
+}
+
 /* ── API calls ───────────────────────────────── */
 async function loadTask() {
   loading.value = true
@@ -380,6 +387,7 @@ function handleKeydown(e: KeyboardEvent) {
           <span v-if="task.isAgentTask" class="meta-chip">🤖 Agent-Task</span>
           <span v-if="task.expectedFrom" class="meta-chip">⏳ Erwartet: {{ task.expectedFrom }}</span>
           <span v-if="task.parentTaskId" class="meta-chip">↳ Sichtbare Child-Task</span>
+          <span v-if="delegationSummary(task)" class="meta-chip">{{ delegationSummary(task) }}</span>
         </div>
       </div>
 
@@ -408,8 +416,9 @@ function handleKeydown(e: KeyboardEvent) {
             </span>
           </div>
 
-          <div v-if="task.isAgentTask || childStatusSummary(task.id)" class="progress-banner">
+          <div v-if="task.isAgentTask || childStatusSummary(task.id) || delegationSummary(task)" class="progress-banner">
             <strong>Letzter Fortschritt:</strong> {{ progressHint(task) }}
+            <span v-if="delegationSummary(task)" class="delegation-inline">· {{ delegationSummary(task) }}</span>
           </div>
 
           <!-- Description -->
@@ -577,6 +586,7 @@ function handleKeydown(e: KeyboardEvent) {
             <dl class="info-list">
               <div><dt>ID</dt><dd>#{{ task.id.slice(0, 8) }}</dd></div>
               <div><dt>Quelle</dt><dd>{{ task.source || '—' }}</dd></div>
+              <div v-if="delegationSummary(task)"><dt>Delegation</dt><dd>{{ delegationSummary(task) }}</dd></div>
               <div><dt>Erstellt</dt><dd>{{ formatDate(task.createdAt) }}</dd></div>
               <div><dt>Geändert</dt><dd>{{ formatDate(task.updatedAt, true) }}</dd></div>
               <div v-if="task.isAgentTask"><dt>Letzter Status</dt><dd>{{ relativeTime(task.lastActivityAt ?? task.updatedAt) }}</dd></div>

ops/nginx-nexus.conf

@@ -30,8 +30,39 @@ server {
 
     client_max_body_size 16m;
 
+    # Bridge-Endpunkte: Gateway-zu-Backend-Agent-Pfad
+    # X-Agent-Id wird durchgereicht für Agent-Identität
+    location /api/bridge/ {
+        proxy_pass http://127.0.0.1:18880;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Agent-Id $http_x_agent_id;
+        proxy_buffering off;
+        proxy_read_timeout 120s;
+    }
+
+    # Dashboard SSE stream: single dedicated non-buffered block.
+    location = /api/dashboard/live {
+        proxy_pass http://127.0.0.1:18880;
+        proxy_http_version 1.1;
+        proxy_set_header Connection "";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_buffering off;
+        proxy_cache off;
+        proxy_read_timeout 1h;
+        proxy_send_timeout 1h;
+        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
+        add_header X-Accel-Buffering no always;
+    }
+
     location / {
         proxy_pass http://127.0.0.1:18880;
+        proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -41,6 +72,7 @@ server {
     # API-Direktzugriff falls nötig
     location /api/ {
         proxy_pass http://127.0.0.1:18880;
+        proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

phases/runtime-routing.md

@@ -24,3 +24,5 @@
 - Einzige aktive Integration: `OpenClawRuntime` über `IAgentRuntime`
 - Model-Routing läuft zentral über OpenClaw Gateway (kein direct provider routing)
 - API kommuniziert via `host.docker.internal:18789` (Gateway loopback — wird über `openclaw_default` Netzwerk gefixt)
+- **Achtung:** `[AllowAnonymous]` auf `/tasks/board` und `/tasks/reset-stale` muss durch ApiKey-Auth ersetzt werden (siehe [Architektur-Review](../docs/architecture-board-first-orchestration.md#61-kritisch--allowanonymous-auf-board-endpunkten))
+- Vollständige Architektur- und Sicherheitsanalyse: [architecture-board-first-orchestration.md](../docs/architecture-board-first-orchestration.md)