Compose execution observers in order

observations.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"go.maximumdirect.net/promptkit/internal/domain"
+	"go.maximumdirect.net/promptkit/internal/observation"
 )
 
 // ExecutionObserver receives immutable metadata events synchronously. Callers
@@ -16,6 +17,12 @@ import (
 // event, and Promptkit keeps no asynchronous queue or durable history.
 type ExecutionObserver func(ExecutionEvent)
 
+// ComposeObservers returns a synchronous ordered fan-out of non-nil observers.
+// It copies the input slice; a panic propagates and prevents later callbacks.
+func ComposeObservers(observers ...ExecutionObserver) ExecutionObserver {
+	return observation.Compose[ExecutionEvent](observers...)
+}
+
 // ExecutionEventKind identifies one point in an execution's lifecycle.
 type ExecutionEventKind string