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src/Signals/StellaOps.Signals/Models/EntrypointPhase.cs

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+using System.Text.Json.Serialization;
+
+namespace StellaOps.Signals.Models;
+
+/// <summary>
+/// Execution phase for entrypoints.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum EntrypointPhase
+{
+    /// <summary>
+    /// Module/assembly initialization.
+    /// </summary>
+    ModuleInit,
+
+    /// <summary>
+    /// Application startup (Main, startup hooks).
+    /// </summary>
+    AppStart,
+
+    /// <summary>
+    /// Runtime request handling.
+    /// </summary>
+    Runtime,
+
+    /// <summary>
+    /// Shutdown/cleanup handlers.
+    /// </summary>
+    Shutdown
+}