fix: add concurrency protection to action sync workflows (#451)

* fix: add concurrency protection to action sync workflows

* style: fix formatting in action/modes.ts

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Co-authored-by: pullfrog[bot] <226033991+pullfrog[bot]@users.noreply.github.com>

test/adhoc/delegateErrorHandling.ts

@@ -1,5 +1,5 @@
 import type { AgentResult, TestRunnerOptions, ValidationCheck } from "../utils.ts";
-import { defineFixture, getAgentOutput, getStructuredOutput } from "../utils.ts";
+import { defineFixture, getAgentOutput } from "../utils.ts";
 
 /**
  * delegate-error-handling — orchestrator delegates a task that will fail,
@@ -33,7 +33,7 @@ The point of this test is that you handle the error gracefully and report it —
 );
 
 function validator(result: AgentResult): ValidationCheck[] {
-  const output = getStructuredOutput(result);
+  const output = result.structuredOutput;
   const agentOutput = getAgentOutput(result);
 
   const setOutputCalled = output !== null;