nuget reorganization

src/Signals/StellaOps.Signals/Options/SignalsAirGapOptions.cs

@@ -4,6 +4,12 @@ namespace StellaOps.Signals.Options;
 
 public sealed class SignalsAirGapOptions
 {
+    /// <summary>
+    /// Optional override for the reachability fact update event topic when running in air-gap mode.
+    /// If not set, defaults to <c>signals.fact.updated</c>.
+    /// </summary>
+    public string? EventTopic { get; set; }
+
     public SignalsSealedModeOptions SealedMode { get; } = new();
 
     public void Validate()

src/Signals/StellaOps.Signals/Options/SignalsCacheOptions.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace StellaOps.Signals.Options;
+
+public sealed class SignalsCacheOptions
+{
+    /// <summary>
+    /// Redis connection string (e.g., "localhost:6379").
+    /// </summary>
+    public string ConnectionString { get; set; } = "localhost:6379";
+
+    /// <summary>
+    /// Default time-to-live for cached reachability facts.
+    /// </summary>
+    public int DefaultTtlSeconds { get; set; } = 600;
+
+    public void Validate()
+    {
+        if (string.IsNullOrWhiteSpace(ConnectionString))
+        {
+            throw new ArgumentException("Cache connection string is required.", nameof(ConnectionString));
+        }
+
+        if (DefaultTtlSeconds <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(DefaultTtlSeconds), "Default TTL must be greater than zero.");
+        }
+    }
+}

src/Signals/StellaOps.Signals/Options/SignalsOptions.cs

@@ -34,6 +34,11 @@ public sealed class SignalsOptions
     /// Reachability scoring configuration.
     /// </summary>
     public SignalsScoringOptions Scoring { get; } = new();
+
+    /// <summary>
+    /// Cache configuration.
+    /// </summary>
+    public SignalsCacheOptions Cache { get; } = new();
 
     /// <summary>
     /// Validates configured options.
@@ -45,5 +50,6 @@ public sealed class SignalsOptions
         Storage.Validate();
         AirGap.Validate();
         Scoring.Validate();
+        Cache.Validate();
     }
 }