fix(freehire-search): drop the github.com URL from the User-Agent (#689)

* fix(freehire-search): drop the github.com URL from the User-Agent

#633 put a contact URL in freehire-search's User-Agent. /apply learns which
hosts an installed portal serves from the host literals in its cli/src, so
github.com became a freehire-search board host: any github.com link (a repo
README or gist presented as a job posting) classified as an installed
portal instead of an unverified source host.

Keep the owner/project/version identifier freehire's API docs ask for and
drop the optional contact URL. Pin github.com and gist.github.com as
unverified in the host-check test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QhZWmcevg3UX9udYi1CsHC

* changelog: place the #689 entry under [Unreleased]

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

---------

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

.agents/skills/freehire-search/url-reference.md

@@ -138,7 +138,8 @@ points users to (`?q=<role>` scopes the counts). Example:
   serves HTML, which `cleanHtml` (`cli/src/helpers.ts`) strips into readable text.
   Search descriptions arrive already rendered by the API and are passed through
   verbatim — stripping them again would undo the Markdown structure.
-- Fetch sends `User-Agent: MadsLorentzen/ai-job-search/1.0 (+https://github.com/MadsLorentzen/ai-job-search; freehire-search)`
+- Fetch sends `User-Agent: MadsLorentzen/ai-job-search/1.0 (freehire-search)` (no contact
+  URL: a host literal in `cli/src` makes `/apply` treat that host as this portal's board)
   and `Accept: application/json`, and uses exponential backoff with jitter on 429/5xx (max 6 retries). A connection error (API
   unreachable) fails fast with a clear message — no retry, since it is not
   transient server load — which is the graceful-degradation contract: an outage