feat: complete task board workflow gates

backend/Controllers/GatewayBridgeController.cs

@@ -38,6 +38,7 @@ namespace Nexus.Api.Controllers;
 public class GatewayBridgeController(
     ITaskBridgeService bridge,
     IAgentService agentService,
+    IConfiguration configuration,
     ILogger<GatewayBridgeController> logger) : ControllerBase
 {
     private const string ApikeyErrorMessage =
@@ -101,6 +102,7 @@ public class GatewayBridgeController(
             priority: command.Priority ?? "Normal",
             assignedTo: command.AssignedTo,
             expectedFrom: command.ExpectedFrom ?? command.AssignedTo,
+            startsInProgress: command.StartsInProgress,
             ct: ct);
 
         return MapResult(result, "create_child_task");
@@ -232,12 +234,13 @@ public class GatewayBridgeController(
     private async Task<(bool Success, string AgentId, ActionResult? ErrorResult)> TryResolveAgentAsync(CancellationToken ct)
     {
         var allowedAgentIds = await agentService.GetAllowedAgentIdsAsync(ct);
+        var allowedActorIds = AgentIdentityCatalog.BuildAllowedActorIds(allowedAgentIds);
 
         var agentHeader = Request.Headers["X-Agent-Id"].FirstOrDefault();
         if (!string.IsNullOrWhiteSpace(agentHeader))
         {
             var normalizedHeader = agentHeader.Trim().ToLowerInvariant();
-            if (allowedAgentIds.Contains(normalizedHeader))
+            if (allowedActorIds.Contains(normalizedHeader))
                 return (true, normalizedHeader, null);
 
             logger.LogWarning("Bridge: ignoring unknown X-Agent-Id '{AgentId}' from {Ip} and continuing auth fallback",
@@ -248,14 +251,17 @@ public class GatewayBridgeController(
         if (User.Identity?.IsAuthenticated == true)
         {
             var normalizedClaim = User.FindFirst(ClaimTypes.NameIdentifier)?.Value?.Trim().ToLowerInvariant();
-            if (!string.IsNullOrWhiteSpace(normalizedClaim) && allowedAgentIds.Contains(normalizedClaim))
+            if (!string.IsNullOrWhiteSpace(normalizedClaim) && allowedActorIds.Contains(normalizedClaim))
                 return (true, normalizedClaim, null);
 
-            if (User.IsInRole("owner") || User.IsInRole("admin") || User.IsInRole("member"))
+            // Browser JWT fallback is intentionally restricted to board owners/admins.
+            // Agent/service traffic should authenticate as an allowed agent or service principal.
+            if (User.IsInRole("owner") || User.IsInRole("admin"))
                 return (true, "bao", null);
         }
 
-        if (User.IsInRole("Service") && allowedAgentIds.Contains("nexus-system"))
+        if (RequestAuthorizationHelper.IsAuthenticatedService(HttpContext, configuration) &&
+            allowedActorIds.Contains("nexus-system"))
             return (true, "nexus-system", null);
 
         var unauthorized = Unauthorized(new { error = ApikeyErrorMessage });
@@ -345,7 +351,8 @@ public sealed record BridgeCreateChildTaskCommand(
     string? Detail = null,
     string? Priority = null,
     string? AssignedTo = null,
-    string? ExpectedFrom = null
+    string? ExpectedFrom = null,
+    bool StartsInProgress = false
 );
 
 public sealed record BridgeUpdateStatusCommand(string State);