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/agnostic/pushRestricted.ts

@@ -1,6 +1,6 @@
 import { randomUUID } from "node:crypto";
 import type { AgentResult, TestRunnerOptions, ValidationCheck } from "../utils.ts";
-import { defineFixture, getStructuredOutput } from "../utils.ts";
+import { defineFixture } from "../utils.ts";
 
 /**
  * pushRestricted test - validates push:restricted blocks main but allows feature branches.
@@ -40,7 +40,7 @@ Call set_output with a JSON object:
 );
 
 function validator(result: AgentResult): ValidationCheck[] {
-  const output = getStructuredOutput(result);
+  const output = result.structuredOutput;
   const setOutputCalled = output !== null;
 
   let parsed: Record<string, unknown> = {};