fix: harden workflow execution recovery

src/workflow-args.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from "vitest";
+import { parseWorkflowArgs } from "./workflow-args.js";
+
+describe("workflow retry-execute arguments", () => {
+  it("accepts an explicit Claude session ID", () => {
+    expect(parseWorkflowArgs([
+      "retry-execute",
+      "--run", "run-123",
+      "--session", "22778b47-e4f3-4645-84cd-1c6a74a912d8",
+    ])).toEqual({
+      sub: "retry-execute",
+      runId: "run-123",
+      sessionId: "22778b47-e4f3-4645-84cd-1c6a74a912d8",
+    });
+  });
+
+  it("preserves retry without a session override", () => {
+    expect(parseWorkflowArgs(["retry-execute", "--run", "run-123"])).toEqual({
+      sub: "retry-execute",
+      runId: "run-123",
+      sessionId: undefined,
+    });
+  });
+});