fix: correct indentation in step.ts if-else block

Fix misplaced closing brace that broke the if-else structure,
causing TypeScript compilation failures.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: pranaygp

packages/core/src/step.ts

@@ -74,7 +74,8 @@ export function createUseStep(ctx: WorkflowOrchestratorContext) {
           // Step has started - so remove from the invocations queue (only on the first "step_started" event)
           if (!hasSeenStepStarted) {
             // O(1) lookup and delete using Map
-            ctx.invocationsQueue.delete(correlationId);
+            if (ctx.invocationsQueue.has(correlationId)) {
+              ctx.invocationsQueue.delete(correlationId);
             } else {
               setTimeout(() => {
                 reject(