test(FN-4493): complete Step 4 — add template parser interop tests

Fusion-Task-Id: FN-4493
Fusion-Task-Lineage: 966c7c55-fd51-4263-9d4e-87e9d06bfb6f

packages/engine/src/__tests__/workflow-step-template-verdicts.test.ts

@@ -0,0 +1,30 @@
+import { WORKFLOW_STEP_TEMPLATES } from "@fusion/core";
+import { describe, expect, it } from "vitest";
+import { inferWorkflowStepVerdictFromProse, parseWorkflowStepVerdict } from "../executor.js";
+
+const TARGET_TEMPLATE_IDS = [
+  "documentation-review",
+  "qa-check",
+  "security-audit",
+  "performance-review",
+  "accessibility-check",
+  "browser-verification",
+  "frontend-ux-design",
+] as const;
+
+describe("workflow step template verdict interoperability", () => {
+  it.each(TARGET_TEMPLATE_IDS)("%s supports canonical JSON and prose fallback", (id) => {
+    const template = WORKFLOW_STEP_TEMPLATES.find((entry) => entry.id === id);
+    expect(template).toBeTruthy();
+
+    expect(parseWorkflowStepVerdict('{"verdict":"APPROVE","notes":""}')).toEqual({ verdict: "APPROVE", notes: "" });
+    expect(parseWorkflowStepVerdict('{"verdict":"APPROVE","notes":"out of scope: no UI files changed"}')).toEqual({
+      verdict: "APPROVE",
+      notes: "out of scope: no UI files changed",
+    });
+    expect(inferWorkflowStepVerdictFromProse("REQUEST REVISION\nfix packages/foo.ts")).toEqual({
+      verdict: "REVISE",
+      notes: "fix packages/foo.ts",
+    });
+  });
+});