Adds AQ_FLEET_GATE (default OFF): the run loop point-reads the cheap per-product
queue version (GET /fleet/queue-state) and SKIPS the expensive /fleet/claim while
the version is unchanged and it is not mid-drain, with a periodic safety backstop
and fail-open-on-read-error so work is never stranded. Keeps POLL_SECONDS for
local job responsiveness rather than raising it globally. selftest 39b covers the
gate decisions; reconciles the M0 section of the dispatch redesign doc.
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Proposes moving fleet work-dispatch off Cosmos busy-polling onto Azure Service
Bus in a coordinator-owns-scheduling / broker-owns-delivery hybrid, fixing the
product-as-queue routing smell and the idle-poll RU cost. Includes phased
migration (M0 RU quick win -> shadow -> cutover -> scale-to-zero) with a ticked
checklist. Self-reviewed (v2) for the outbox/change-feed, message-size,
long-job lock, idempotency, and routing-model consistency issues.
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