fix(portal-clis): emit the contract's id field from jobnet and jobdanmark search results (#518)

/add-portal's contract says every search result carries at least id,
title, company, location, date, url, and the four other shipped CLIs
emit id. When #340 added the company/location/date/url aliases to these
two, id was left out: jobnet exposed the value only as jobAdId,
jobdanmark only as slug, so a consumer reading every portal's JSON
through one shape had to special-case both to call detail.

Purely additive: id equals jobAdId on jobnet and slug on jobdanmark, the
native keys stay, nothing is renamed. Each SKILL.md notes the alias. The
additive-contract test in each CLI now asserts id and its equality with
the native key; both fail on master.

.agents/skills/jobdanmark-search/cli/src/commands/search.ts

@@ -74,6 +74,10 @@ export function normalizeItem(item: ApiSearchItem): Record<string, unknown> {
     applicationDeadline: item.applicationDeadline ?? null,
     url: fullUrl,
     slug,
+    // /scrape contract aliases (add-portal.md: every result carries at least
+    // id, title, company, location, date, url). `id` is the slug - the value
+    // `detail` takes - under the name every other portal CLI uses.
+    id: slug,
     company: item.companyName,
     location: extractCity(item.companyAddress),
     date: toContractDate(item.publishedDate),