fix: unify sync state tracking for negentropy and REQ+EOSE paths

When negentropy (NIP-77) sync was enabled, the RelaySyncIndex was never
updated to reflect historical sync completion. This caused the three-way
diff algorithm in compute_actions() to malfunction, leading to:
- Repeated sync attempts for the same items
- Incorrect filter counting for consolidation
- Potential premature relay disconnection

This fix unifies both sync paths (REQ+EOSE and Negentropy) through a
consistent PendingBatch flow:

1. Added SyncMethod enum to distinguish between sync types
2. Updated PendingBatch struct to include sync_method field
3. Extracted confirm_batch() method for unified batch confirmation
4. Modified negentropy_sync_and_process() to:
   - Create a PendingBatch before sync
   - Add batch to pending_sync_index
   - On success: Remove batch and call confirm_batch()
   - On failure: Remove batch without confirming

The confirm_batch() method moves repos and root_events from the batch
to the RelayState.repos and RelayState.root_events, ensuring the
three-way diff works correctly regardless of sync method.

Closes: negentropy-sync-state-tracking.md

0 files changed, 0 insertions, 0 deletions