feat: complete Nexus mission-control workflows

backend/Services/StaleTaskRecoveryOptions.cs

@@ -0,0 +1,13 @@
+namespace Nexus.Api.Services;
+
+public sealed class StaleTaskRecoveryOptions
+{
+    public const string SectionName = "TaskRecovery";
+
+    public int StaleHours { get; set; } = 2;
+    public int IntervalMinutes { get; set; } = 30;
+
+    public TimeSpan GetStaleThreshold() => TimeSpan.FromHours(Math.Max(1, StaleHours));
+
+    public TimeSpan GetInterval() => TimeSpan.FromMinutes(Math.Max(1, IntervalMinutes));
+}