Diagnostic coverage for the 'search vanished' report. Proves the bot side
of result delivery is correct end to end (right shape reaches IN_COMM_Q;
empty result still delivered; wrong api-key -> 401 vanish; uuid mismatch
-> orphaned away from the querent), which isolates a SYSTEMATIC vanish to
transport: the librarian being unable to reach the bot's /conjurer at all
(CONJURER_MAIN_BOT). The bot Service is NodePort with no pinned nodePort
while the librarian hardcodes :32442 - and being in-cluster it should use
the Service DNS http://bot:5000 instead.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
