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/jobbank-search/cli/tests/cli-contract.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, test } from "bun:test";
+import { runCLI } from "./helpers";
+
+function parseError(stderr: string): { error: string; code: string } {
+  return JSON.parse(stderr);
+}
+
+describe("Jobbank CLI error contract", () => {
+  test("search without a filter fails with JSON on stderr", async () => {
+    const result = await runCLI(["search"]);
+
+    expect(result.exitCode).toBe(1);
+    expect(result.stdout).toBe("");
+    expect(parseError(result.stderr)).toEqual({
+      error: "--key or at least one filter is required",
+      code: "MISSING_REQUIRED",
+    });
+  });
+
+  test("detail without an ID fails before making a request", async () => {
+    const result = await runCLI(["detail"]);
+
+    expect(result.exitCode).toBe(1);
+    expect(result.stdout).toBe("");
+    expect(parseError(result.stderr)).toEqual({
+      error: "Job ID is required",
+      code: "MISSING_REQUIRED",
+    });
+  });
+});