Remove unused Correlation and Transaction from Tracing (#26)

The correlation and transaction fields were written to event tags
(x-correlation, x-transaction) but never read back or consumed by
any code. Tracing.readFrom() was never called, and neither
.correlation() nor .transaction() were accessed on any Tracing
instance. Remove both record types and their associated tag
constants, builder methods, and constructor parameters.

https://claude.ai/code/session_011LFvcrknJvPNu6Q3umNe8f

Co-authored-by: Claude <noreply@anthropic.com>

Author: vanrogu

sliceworkz-eventmodeling-api/src/main/java/org/sliceworkz/eventmodeling/events/Correlation.java

@@ -26,11 +26,11 @@
 import org.sliceworkz.eventstore.events.Tag;
 import org.sliceworkz.eventstore.events.Tags;
 
-public record Tracing ( Instance instance, Correlation correlation, Transaction transaction, String actor, String channel ) {
+public record Tracing ( Instance instance, String actor, String channel ) {
 
 	public static final String UNKNOWN_ACTOR = null;
 	public static final String UNKNOWN_CHANNEL = null;
-	
+
 	public static final String AUTOMATION_ACTOR = "automation";
 	public static final String AUTOMATION_CHANNEL = "automation";
 
@@ -41,51 +41,35 @@ public record Tracing ( Instance instance, Correlation correlation, Transaction
 	private static final String TAG_INSTANCE_LOGICAL = "x-instance-logical";
 	private static final String TAG_INSTANCE_PHYSICAL = "x-instance-physical";
 	private static final String TAG_INSTANCE_PROCESS = "x-instance-process";
-	private static final String TAG_CORRELATION = "x-correlation";
-	private static final String TAG_TRANSACTION = "x-transaction";
 	private static final String TAG_CHANNEL = "x-channel";
 	private static final String TAG_ACTOR = "x-actor";
 
-	private static ThreadLocal<Tracing> tracingPerThread  = new ThreadLocal<Tracing>();
-	
-	public Tracing correlation ( Correlation correlation ) {
-		return new Tracing ( instance, correlation, transaction, actor, channel );
-	}
-
-	public Tracing transaction ( Transaction transaction ) {
-		return new Tracing ( instance, correlation, transaction, actor, channel );
-	}
-
 	public Tracing actor ( String actor ) {
-		return new Tracing ( instance, correlation, transaction, actor, channel );
+		return new Tracing ( instance, actor, channel );
 	}
-	
+
 	public Tracing channel ( String channel ) {
-		return new Tracing ( instance, correlation, transaction, actor, channel );
-	}
-	
-	public Tracing newTransaction ( ) {
-		return transaction(Transaction.create());
+		return new Tracing ( instance, actor, channel );
 	}
-	
+
 	public static final Tracing init ( Instance instance ) {
-		return new Tracing(instance, Correlation.create(), Transaction.create(), UNKNOWN_ACTOR, UNKNOWN_CHANNEL);
+		return new Tracing(instance, UNKNOWN_ACTOR, UNKNOWN_CHANNEL);
 	}
-	
+
 	public Tracing instance ( Instance instance ) {
-		return new Tracing(instance, correlation, transaction, actor, channel);
+		return new Tracing(instance, actor, channel);
 	}
 
 	public static final Tracing actorAndChannel ( String actor, String channel ) {
-		return new Tracing ( null, null, null, actor, channel);
+		return new Tracing ( null, actor, channel);
 	}
 
 	public static final Tracing automation ( Instance instance ) {
-		return new Tracing(instance, Correlation.create(), Transaction.create(), AUTOMATION_ACTOR, AUTOMATION_CHANNEL);
+		return new Tracing(instance, AUTOMATION_ACTOR, AUTOMATION_CHANNEL);
 	}
 
 	public static final Tracing kernel ( Instance instance ) {
-		return new Tracing(instance, Correlation.create(), Transaction.create(), KERNEL_ACTOR, KERNEL_CHANNEL);
+		return new Tracing(instance, KERNEL_ACTOR, KERNEL_CHANNEL);
 	}
 
 	public static final <T> Event<T> removeFrom ( Event<T> event ) {
@@ -100,12 +84,10 @@ public static final Tracing readFrom ( Event<?> event ) {
 				tagValue(event, TAG_INSTANCE_PHYSICAL).orElse(null),
 				tagValue(event, TAG_INSTANCE_PROCESS).orElse(null)
 				);
-		Transaction transaction = tagValue(event, TAG_TRANSACTION).map(Transaction::of).orElse(null);
-		Correlation correlation = tagValue(event, TAG_CORRELATION).map(Correlation::of).orElse(null);
 		String actor = tagValue(event, TAG_ACTOR).orElse(null);
 		String channel = tagValue(event, TAG_CHANNEL).orElse(null);
-			
-		return new Tracing(instance, correlation, transaction, actor, channel);
+
+		return new Tracing(instance, actor, channel);
 	}
 
 	private static final Optional<String> tagValue ( Event<?> event, String tagName ) {
@@ -126,8 +108,6 @@ public final <T> EphemeralEvent<T> storeOn ( EphemeralEvent<? extends T> event )
 			addTag(tags, TAG_INSTANCE_PHYSICAL, instance.physical());
 			addTag(tags, TAG_INSTANCE_PROCESS, instance.process());
 		}
-		addTag(tags, TAG_CORRELATION, correlation == null ? null: correlation.id());
-		addTag(tags, TAG_TRANSACTION, transaction == null ? null: transaction.id());
 		addTag(tags, TAG_CHANNEL, channel);
 		addTag(tags, TAG_ACTOR, actor);