nuget reorganization

src/Signals/__Tests/StellaOps.Signals.Tests/InMemoryEventsPublisherTests.cs

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+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using StellaOps.Signals.Models;
+using StellaOps.Signals.Services;
+using Xunit;
+
+namespace StellaOps.Signals.Tests;
+
+public class InMemoryEventsPublisherTests
+{
+    [Fact]
+    public async Task PublishFactUpdatedAsync_EmitsStructuredEvent()
+    {
+        var logger = new TestLogger<InMemoryEventsPublisher>();
+        var publisher = new InMemoryEventsPublisher(logger);
+
+        var fact = new ReachabilityFactDocument
+        {
+            SubjectKey = "tenant:image@sha256:abc",
+            CallgraphId = "cg-123",
+            ComputedAt = System.DateTimeOffset.Parse("2025-11-18T12:00:00Z"),
+            States = new List<ReachabilityStateDocument>
+            {
+                new() { Target = "pkg:pypi/django", Reachable = true, Confidence = 0.9 },
+                new() { Target = "pkg:pypi/requests", Reachable = false, Confidence = 0.2 }
+            },
+            RuntimeFacts = new List<RuntimeFactDocument>
+            {
+                new() { SymbolId = "funcA", HitCount = 3 }
+            }
+        };
+
+        await publisher.PublishFactUpdatedAsync(fact, CancellationToken.None);
+
+        Assert.Contains("signals.fact.updated", logger.LastMessage);
+        Assert.Contains("\"subjectKey\":\"tenant:image@sha256:abc\"", logger.LastMessage);
+        Assert.Contains("\"callgraphId\":\"cg-123\"", logger.LastMessage);
+        Assert.Contains("\"reachableCount\":1", logger.LastMessage);
+        Assert.Contains("\"unreachableCount\":1", logger.LastMessage);
+        Assert.Contains("\"runtimeFactsCount\":1", logger.LastMessage);
+    }
+
+    private sealed class TestLogger<T> : ILogger<T>
+    {
+        public string LastMessage { get; private set; } = string.Empty;
+
+        public IDisposable BeginScope<TState>(TState state) => NullScope.Instance;
+
+        public bool IsEnabled(LogLevel logLevel) => true;
+
+        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, System.Exception? exception, Func<TState, System.Exception?, string> formatter)
+        {
+            LastMessage = formatter(state, exception);
+        }
+
+        private sealed class NullScope : IDisposable
+        {
+            public static readonly NullScope Instance = new();
+            public void Dispose() { }
+        }
+    }
+}