The env-scoped /routes/{routeId}/diagram endpoint filtered diagrams by
the currently-live agent instance_ids. Routes removed between app
versions have no live publisher, so the lookup returned 404 even though
the historical diagram row still exists in route_diagrams. Sidebar
entries for removed routes showed "no diagram" as a result.
Switch to findLatestContentHashForAppRoute which resolves directly off
(applicationId, environment, routeId) + created_at DESC, independent of
the agent registry. The controller no longer depends on
AgentRegistryService.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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