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/jobnet-search/cli/src/commands/search.ts

@@ -104,6 +104,10 @@ export function createSearchOutput(data: SearchApiResponse, flags: SearchFlags)
     workPlaceAddress: job.workPlaceAddress ?? "",
     isSeen: job.isSeen,
     isFavorite: job.isFavorite,
+    // /scrape contract aliases (add-portal.md: every result carries at least
+    // id, title, company, location, date, url). `id` is the jobAdId - the
+    // value `detail` takes - under the name every other portal CLI uses.
+    id: job.jobAdId,
     company: job.hiringOrgName,
     location: job.postalDistrictName ?? job.municipality ?? null,
     date: job.publicationDate ? job.publicationDate.slice(0, 10) : null,