Both catalog controllers resolved the from-endpoint URI via
findContentHashForRouteByAgents, which filtered by the currently-live
agent instance_ids. Routes removed between app versions therefore lost
their fromUri even though the diagram row still exists.
Route through findLatestContentHashForAppRoute so resolution depends
only on (app, env, route) — stays populated for historical routes.
CatalogController now resolves the per-row env slug up-front so the
fromUri lookup works even for cross-env queries against managed apps.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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