So one librarian can serve several bots (test + deploy) instead of firing
every result/pong at a single static CONJURER_MAIN_BOT.
* The bot includes its own callback address (CONJURER_SELF_CALLBACK) in
every /query and /ping.
* The librarian stores that callback with the query (persisted with the
request, so a replay after restart still answers the right bot) and, for
results, in the OUTBOX entry ({target, payload}) so the resender delivers
to the origin bot even across a librarian restart.
* Pongs go back to the pinging bot too - otherwise a second bot's health
check would be ponged to the first and always time out, so it could
never enable its librarian cog.
* Empty callback falls back to MAIN_BOT_ADDRESS, and a legacy OUTBOX entry
(raw payload, pre-callback) is still delivered to the default bot, so the
upgrade is seamless.
Tests: per-origin result delivery + legacy-shape fallback (outbox),
busy/idle pong routed to the callback bot vs default (lifecycle). Suite:
58 unit + 52 integration green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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