resolveLetterEventLinks iterated `eventRepository.findAll()` and touched
the lazy `documents` collection on every event — including events removed
by the type/person/generation/year filters and never shown. On a large
archive that hydrates join rows that are immediately discarded.
It now runs over the events that survived the filter (collected once in
the existing event loop). A letter whose only linking event was filtered
out links to nothing, which matches the frontend's filter-then-cluster
(the letter renders loose either way). Fixes review finding #10 (DevOps).
Refs #850
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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