prep docs and service updates

tests/AirGap/StellaOps.AirGap.Time.Tests/AirGapOptionsValidatorTests.cs

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+using Microsoft.Extensions.Options;
+using StellaOps.AirGap.Time.Config;
+using StellaOps.AirGap.Time.Models;
+
+namespace StellaOps.AirGap.Time.Tests;
+
+public class AirGapOptionsValidatorTests
+{
+    [Fact]
+    public void FailsWhenTenantMissing()
+    {
+        var opts = new AirGapOptions { TenantId = "" };
+        var validator = new AirGapOptionsValidator();
+        var result = validator.Validate(null, opts);
+        Assert.True(result is ValidateOptionsResultFailure);
+    }
+
+    [Fact]
+    public void FailsWhenWarningExceedsBreach()
+    {
+        var opts = new AirGapOptions { TenantId = "t", Staleness = new StalenessOptions { WarningSeconds = 20, BreachSeconds = 10 } };
+        var validator = new AirGapOptionsValidator();
+        var result = validator.Validate(null, opts);
+        Assert.True(result is ValidateOptionsResultFailure);
+    }
+
+    [Fact]
+    public void SucceedsForValidOptions()
+    {
+        var opts = new AirGapOptions { TenantId = "t", Staleness = new StalenessOptions { WarningSeconds = 10, BreachSeconds = 20 } };
+        var validator = new AirGapOptionsValidator();
+        var result = validator.Validate(null, opts);
+        Assert.True(result.Succeeded);
+    }
+}