refactor(cache): P3 simplifications — remove dead code, reduce abstractions
- Replace SubscriptionHealth map + data class with single lastEventAt
Long? timestamp (only consumer was RelayHealthIndicator taking max())
- Replace consumer HashMap registry with when block (safe casts,
compiler-checked, 9 kinds doesn't benefit from O(1) lookup)
- Remove dead loadReactionsForNotes() (superseded by requestInteractions)
- Remove unused BoundedLargeCache methods: containsKey, isEmpty,
mapNotNull, forEach (zero external callers)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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