fix(jobbank-search): emit date key derived from posted in search output (#342)

jobbank search output was missing the shared contract's date field; it now emits date as YYYY-MM-DD derived from posted (kept unchanged), null when the feed item has no pubDate. The inline result mapping is extracted into an exported normalizeSearchItem (behavior-preserving) so the derivation is pinned by tests.

Co-authored-by: oscarbol09 <80536682+oscarbol09@users.noreply.github.com>

.agents/skills/jobbank-search/cli/tests/search-normalization.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, test } from "bun:test";
+import { normalizeSearchItem } from "../src/commands/search";
+import type { RssItem } from "../src/helpers";
+
+function rssItem(): RssItem {
+  return {
+    title: "Data Scientist",
+    description: "Fuldtidsjob hos Acme A/S, København (Ansøgningsfrist: 31.07.2026)",
+    link: "https://jobbank.dk/job/12345/acme/data-scientist",
+    pubDate: "Fri, 14 Aug 2026 09:30:00 +0200",
+  };
+}
+
+describe("Jobbank search normalization", () => {
+  test("derives the /scrape contract date from posted as YYYY-MM-DD", () => {
+    const result = normalizeSearchItem(rssItem());
+
+    expect(result.posted).toBe("2026-08-14T07:30:00.000Z");
+    expect(result.date).toBe((result.posted as string).slice(0, 10));
+    expect(result.date).toBe("2026-08-14");
+  });
+
+  test("emits a null date when pubDate is absent (posted is empty)", () => {
+    const result = normalizeSearchItem({ ...rssItem(), pubDate: "" });
+
+    expect(result.posted).toBe("");
+    expect(result.date).toBeNull();
+  });
+
+  test("keeps the native fields alongside the contract date (additive)", () => {
+    const result = normalizeSearchItem(rssItem());
+
+    expect(result.company).toBe("Acme A/S");
+    expect(result.location).toBe("København");
+    expect(result.url).toBe("https://jobbank.dk/job/12345/acme/data-scientist");
+    expect(result.deadline).toBe("31.07.2026");
+  });
+});