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/src/commands/search.ts

@@ -1,6 +1,24 @@
 import { defineCommand, option } from "@bunli/core"
 import { z } from "zod"
-import { rssFetch, fetchWithUA, writeError, parseRssDescription, extractJobIdFromUrl, BASE_URL } from "../helpers.js"
+import { rssFetch, fetchWithUA, writeError, parseRssDescription, extractJobIdFromUrl, BASE_URL, type RssItem } from "../helpers.js"
+
+export function normalizeSearchItem(item: RssItem): Record<string, unknown> {
+  const parsed = parseRssDescription(item.description)
+  const id = extractJobIdFromUrl(item.link)
+  const posted = item.pubDate ? new Date(item.pubDate).toISOString() : ""
+  return {
+    id,
+    title: item.title,
+    company: parsed.company,
+    location: parsed.location,
+    jobType: parsed.jobType,
+    description: item.description,
+    url: item.link,
+    posted,
+    date: posted ? posted.slice(0, 10) : null,
+    deadline: parsed.deadline,
+  }
+}
 
 export const search = defineCommand({
   name: "search",
@@ -134,22 +152,7 @@ export const search = defineCommand({
       }
 
       // Normalize items
-      let results = items.map((item) => {
-        const parsed = parseRssDescription(item.description)
-        const id = extractJobIdFromUrl(item.link)
-        const posted = item.pubDate ? new Date(item.pubDate).toISOString() : ""
-        return {
-          id,
-          title: item.title,
-          company: parsed.company,
-          location: parsed.location,
-          jobType: parsed.jobType,
-          description: item.description,
-          url: item.link,
-          posted,
-          deadline: parsed.deadline,
-        }
-      })
+      let results = items.map(normalizeSearchItem)
 
       // Apply limit
       if (flags.limit !== undefined) {