Adds a new /fleet route that shows a fleet-wide overview of all
configured Honcho instances. Each row renders per-instance metrics
(workspace count, total conclusions, queue activity, last seen, health)
by fanning out scoped fetches via createScopedClient, and aggregates
into top-level metric cards.
Reuses the Phase 2 scoped-client pattern. Extends compareQueries.ts
with useScopedQueueStatus and useScopedConclusionsCount, plus option
builders so useQueries can fan out per-workspace requests inside
FleetRow without duplicating query logic.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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