Isolate execution observations and preserve injected error categories

internal/observation/recorder.go

@@ -191,6 +191,24 @@ func (r *Recorder) deliver(event domain.ExecutionEvent) {
 
 type contextKey struct{}
 
+// WithoutExecutionState starts a public operation without inheriting another
+// invocation's recorder or prepared-claim sink. Other context values and all
+// cancellation/deadline behavior remain with the caller's context.
+func WithoutExecutionState(ctx context.Context) context.Context {
+	return executionBoundary{Context: ctx}
+}
+
+type executionBoundary struct{ context.Context }
+
+func (c executionBoundary) Value(key any) any {
+	switch key.(type) {
+	case contextKey, claimSinkKey:
+		return nil
+	default:
+		return c.Context.Value(key)
+	}
+}
+
 // WithRecorder carries one invocation's recorder through internal client calls.
 func WithRecorder(ctx context.Context, recorder *Recorder) context.Context {
 	return context.WithValue(ctx, contextKey{}, recorder)