Pass compensation closures to all() instead of pre-resolving them

Workflow::compensate() with parallelCompensation=true called each compensation
closure inside the foreach loop, then passed the resolved scalar results to
all(). AllCall rejects anything that isn't an ActivityCall, ChildWorkflowCall,
or nested AllCall, so the parallel branch threw LogicException on the first
compensation that returned a scalar — killing the workflow before it could
complete.

Pass the closures themselves: all() runs each one through whileInactive() so
activity()/child() inside the closure returns the call object instead of
suspending the fiber, which is what AllCall expects.

Refs #399 (bucket D — parallel saga completion-condition failures)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: durable-workflow-ops

src/V2/Workflow.php

@@ -144,20 +144,20 @@ public function compensate(): void
         $reversed = array_reverse($this->compensations);
 
         if ($this->parallelCompensation) {
-            $calls = [];
-
-            foreach ($reversed as $compensation) {
-                $calls[] = $compensation();
-            }
-
+            // Pass each compensation closure directly to all(): it uses
+            // whileInactive() to capture the ActivityCall/ChildWorkflowCall the
+            // closure produces without executing it serially in-fiber. Calling
+            // $compensation() here would resolve the activity synchronously and
+            // hand all() plain string results, which it rejects (AllCall only
+            // accepts the call objects).
             if ($this->continueWithError) {
                 try {
-                    all($calls);
+                    all($reversed);
                 } catch (Throwable) {
                     // continueWithError applies uniformly: swallow parallel compensation failures
                 }
             } else {
-                all($calls);
+                all($reversed);
             }
         } else {
             foreach ($reversed as $compensation) {