Codex+Opus pre-release gate both flagged: TimeoutError is now in the
consolidated _CLIENT_DISCONNECT_ERRORS dispatch set, so a bare socket-connect
TimeoutError from Joplins urlopen(timeout=8) — which is NOT always URLError-
wrapped — would escape _handle_notes_search and be swallowed by the dispatch
disconnect handler as a fake client disconnect (silent empty response, no log).
Catch (URLError, TimeoutError) at the route so it surfaces as a clean
"not reachable" ValueError -> JSON error. Adds a regression test.
Co-authored-by: someaka <someaka@users.noreply.github.com>
nesquena-hermes