docs consolidation and others

src/Scheduler/__Libraries/StellaOps.Scheduler.Queue/Redis/IRedisSchedulerQueuePayload.cs

@@ -23,4 +23,27 @@ internal interface IRedisSchedulerQueuePayload<TMessage>
     string? GetCorrelationId(TMessage message);
 
     IReadOnlyDictionary<string, string>? GetAttributes(TMessage message);
+
+    // HLC fields for deterministic ordering (SPRINT_20260105_002_002)
+    // Default implementations return null for backward compatibility
+
+    /// <summary>
+    /// Gets the HLC timestamp string for deterministic ordering.
+    /// </summary>
+    string? GetTHlc(TMessage message) => null;
+
+    /// <summary>
+    /// Gets the chain link (hex-encoded SHA-256) proving sequence position.
+    /// </summary>
+    string? GetChainLink(TMessage message) => null;
+
+    /// <summary>
+    /// Gets the previous chain link (hex-encoded, null for first entry).
+    /// </summary>
+    string? GetPrevChainLink(TMessage message) => null;
+
+    /// <summary>
+    /// Gets the payload hash (hex-encoded SHA-256).
+    /// </summary>
+    string? GetPayloadHash(TMessage message) => null;
 }