Completes the escalation-event repository/service changes from the prior
commit: normalizes the exactOptionalPropertyTypes mismatch in the
findFirst fallback lookup, and updates every existing unit test
(sla-pause-resume, sla-breach-detection, sla-compliance-metric,
escalation-rule-match) to the new SlaRunRepository.updateWithVersion and
EscalationEventRepository.create({event, wasNewlyCreated}) signatures.
Full typecheck/lint/architecture-check clean.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>