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>

CHANGELOG.md

@@ -288,6 +288,19 @@ per-file diff commands.
   characters are quoted whole as before. One new case fails on master; the short-line case
   pins the unchanged behaviour.
 
+- **Jobnet CLI detail command emits degraded search summary signal on stdout** (#550, fixes #549,
+  `.agents/skills/jobnet-search/cli/src/commands/detail.ts`,
+  `.agents/skills/jobnet-search/cli/tests/detail-fallback.test.ts`,
+  `.agents/skills/jobnet-search/cli/tests/detail-formatting.test.ts`,
+  `.agents/skills/jobnet-search/cli/README.md`) - when `runDetail`
+  resolved an external ad via the search endpoint fallback introduced in #432, it wrote an
+  informational note directly to `process.stderr`. To keep `jobnet-search` stderr behavior
+  consistent with the other portal CLIs (silent `stderr` on exit 0), the signal that detail
+  was synthesized from search results has moved to `stdout` as a `source: "search-fallback"`
+  field on the detail object, rendered in plain and table output as `Source: search-fallback
+  (detail unavailable, synthesised from search)`, documented in the CLI README, and covered
+  by automated tests.
+
 ### Security
 
 - **CI no longer leaves the job token in `.git/config` or expands a PR-controlled name into a