fix(jobnet-search): emit source: search-fallback on stdout for external ads (#549) (#550)

* fix(jobnet-search): emit source: search-fallback on stdout for external ads (#549)

Move the degraded search summary signal from stderr to stdout as a source: search-fallback field on DetailApiResponse. Keeps stderr quiet on success across all portal CLIs, renders the degraded signal in plain and table format outputs, documents the optional field in the CLI README, and covers the fallback execution path with tests.

* changelog: place the #550 entry under [Unreleased]

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Mads Lorentzen <madslorentzen_17@hotmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/jobnet-search/cli/README.md

@@ -170,10 +170,10 @@ bun run src/cli.ts search \
 
 ## `detail` — Full job ad detail
 
-**Endpoint**: `GET /FindJob/JobAdDetails/{id}`
+**Endpoint**: `GET /FindJob/JobAdDetails/{id}` (falls back to `GET /FindJob/Search?searchString={id}` on 404 for external ads)
 
 ```bash
-bun run src/cli.ts detail <id> [--format json|plain]
+bun run src/cli.ts detail <id> [--format json|table|plain]
 ```
 
 The `id` is the `jobAdId` UUID from `search` results.
@@ -252,6 +252,8 @@ bun run src/cli.ts detail 9ef43bce-d82b-4ea1-a098-7ff6520f99be --format plain
 
 > **Note**: `body` contains raw HTML. In `--format plain` output the CLI strips HTML tags to produce readable text.
 
+> **Note**: The optional `source` field indicates whether detail was synthesized from the search endpoint fallback (`"search-fallback"`) when `JobAdDetails` returned 404 for an external ad. Direct responses omit `source`. When present, plain and table formats render a `Source: search-fallback (detail unavailable, synthesised from search)` line.
+
 > **Note**: `application.url` may be empty for some job ads — the employer may only accept applications through Jobnet's internal system.
 
 ---