Restructure solution layout by module

src/Notify/__Libraries/StellaOps.Notify.Models/NotifyEnums.cs

@@ -0,0 +1,70 @@
+using System.Text.Json.Serialization;
+
+namespace StellaOps.Notify.Models;
+
+/// <summary>
+/// Supported Notify channel types.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum NotifyChannelType
+{
+    Slack,
+    Teams,
+    Email,
+    Webhook,
+    Custom,
+}
+
+/// <summary>
+/// Delivery lifecycle states tracked for audit and retries.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum NotifyDeliveryStatus
+{
+    Pending,
+    Sent,
+    Failed,
+    Throttled,
+    Digested,
+    Dropped,
+}
+
+/// <summary>
+/// Individual attempt status recorded during delivery retries.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum NotifyDeliveryAttemptStatus
+{
+    Enqueued,
+    Sending,
+    Succeeded,
+    Failed,
+    Throttled,
+    Skipped,
+}
+
+/// <summary>
+/// Rendering modes for templates to help connectors decide format handling.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum NotifyTemplateRenderMode
+{
+    Markdown,
+    Html,
+    AdaptiveCard,
+    PlainText,
+    Json,
+}
+
+/// <summary>
+/// Structured representation of rendered payload format.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum NotifyDeliveryFormat
+{
+    Slack,
+    Teams,
+    Email,
+    Webhook,
+    Json,
+}