Restructure solution layout by module

src/Concelier/__Libraries/StellaOps.Concelier.Connector.Common/DocumentStatuses.cs

@@ -0,0 +1,27 @@
+namespace StellaOps.Concelier.Connector.Common;
+
+/// <summary>
+/// Well-known lifecycle statuses for raw source documents as they move through fetch/parse/map stages.
+/// </summary>
+public static class DocumentStatuses
+{
+    /// <summary>
+    /// Document captured from the upstream source and awaiting schema validation/parsing.
+    /// </summary>
+    public const string PendingParse = "pending-parse";
+
+    /// <summary>
+    /// Document parsed and sanitized; awaiting canonical mapping.
+    /// </summary>
+    public const string PendingMap = "pending-map";
+
+    /// <summary>
+    /// Document fully mapped to canonical advisories.
+    /// </summary>
+    public const string Mapped = "mapped";
+
+    /// <summary>
+    /// Document failed processing; requires manual intervention before retry.
+    /// </summary>
+    public const string Failed = "failed";
+}