Proof: npm test; node --test test/history-writer-static.test.mjs test/kafka-topics.test.mjs test/environment-status-history.test.mjs; node --check src/apps/history-writer.mjs.
Assumptions: Durable history consumers are idempotent by event_id, so from-beginning subscription is safe when a topic has no committed group offset.
Still fake: This protects durable event capture for repo-owned Kafka topics; it does not backfill events that were never published to Kafka.
