test(cli): cover Jobbank and Jobdanmark contracts (#148)

Jobbank and Jobdanmark each had only one narrow test, leaving required-argument errors, RSS normalization, JSON-LD variants, and malformed-page handling unprotected.

Add network-free fixture and subprocess tests for repeated RSS filters, description and ID parsing, stderr JSON errors, Bunli numeric validation, JSON-LD objects and arrays, optional fields, not-found pages, and parse failures.

The suites now cover eight Jobbank cases and six Jobdanmark cases without making live portal requests.

.agents/skills/jobdanmark-search/cli/tests/cli-contract.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, test } from "bun:test";
+import { runCLI } from "./helpers";
+
+describe("Jobdanmark CLI error contract", () => {
+  test("detail without a slug fails with JSON on stderr", async () => {
+    const result = await runCLI(["detail"]);
+
+    expect(result.exitCode).toBe(1);
+    expect(result.stdout).toBe("");
+    expect(JSON.parse(result.stderr)).toEqual({
+      error: "slug argument is required",
+      code: "MISSING_REQUIRED",
+    });
+  });
+
+  test("an invalid numeric option fails before making a request", async () => {
+    const result = await runCLI(["search", "--page", "not-a-number"]);
+    const error = JSON.parse(result.stderr);
+
+    expect(result.exitCode).toBe(1);
+    expect(result.stdout).toBe("");
+    expect(error.ok).toBe(false);
+    expect(error.error.kind).toBe("validation");
+    expect(error.error.option).toBe("page");
+    expect(error.error.message).toContain("Expected number");
+  });
+});