feat(sync): validate negentropy event receipt and retry missing events

Add validation that all events requested by ID during negentropy sync
are actually received from the relay. When events are missing:

- Log detailed information (requested/received/missing counts and IDs)
- Create retry subscriptions for missing events (chunked by 300)
- Update batch to track only missing events in next round
- Only complete batch after all events received or retry fails

This handles relays that have limits on ID-based queries (e.g., max 150
events per query) by automatically retrying in smaller chunks.

Also excludes purgatory and rejected announcement events from negentropy
requests to avoid re-requesting events we know we can't/won't store.

Note: Current implementation lacks retry limit - infinite loop protection
needed (tracked as future work).

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