Add execution control request contracts

convert.go

@@ -1,6 +1,7 @@
 package promptkit
 
 import (
+	"context"
 	"fmt"
 	"unicode/utf8"
 
@@ -30,7 +31,15 @@ func toDomainRunRequest(req RunRequest) (domain.RunRequest, error) {
 		callback := req.Observer
 		observer = func(event domain.ExecutionEvent) { callback(fromDomainExecutionEvent(event)) }
 	}
+	var onPrepared func(context.Context, *domain.PreparedRun)
+	if callback := req.OnPrepared; callback != nil {
+		onPrepared = func(ctx context.Context, prepared *domain.PreparedRun) {
+			callback(ctx, *fromDomainPreparedRun(prepared))
+		}
+	}
 	return domain.RunRequest{
+		OperationTimeout: req.OperationTimeout,
+		OnPrepared:       onPrepared,
 		CaptureExchange:  req.CaptureExchange || req.ContinueFrom != nil,
 		PromptID:         req.PromptID,
 		ProfileID:        req.ProfileID,