txtracker tests (7 tests):
- NotifyReceived: stats empty before chain events
- InclusionEMA: EMA increases on inclusion, decays on empty blocks
- Finalization: Finalized counter credited after finalization
- MultiplePeers: each peer credited for own txs only
- FirstDelivererWins: duplicate delivery ignored
- NoFinalizationCredit: no credit without finalization
- EMADecay: EMA approaches zero after 30 empty blocks
dropper tests (6 tests):
- FilterProtectedNoStats: nil stats → all droppable
- FilterProtectedEmptyStats: empty map → all droppable
- FilterProtectedTopPeer: top-scored peers removed from droppable
- FilterProtectedZeroScore: zero scores → no protection
- FilterProtectedOverlap: peer top in both categories → counted once
- FilterProtectedAllProtected: all droppable protected → empty list
Also fix: create peer entries during EMA update for peers with
inclusions in the current block (previously only created during
finalization, so EMA was not tracked before first finalization).
