chore(op-dispute-mon): bind enrichers (#9908)

op-dispute-mon/mon/extract/balance_enricher.go

@@ -10,12 +10,13 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 )
 
+var _ Enricher = (*BalanceEnricher)(nil)
+
 type BalanceCaller interface {
 	GetBalance(context.Context, rpcblock.Block) (*big.Int, common.Address, error)
 }
 
-type BalanceEnricher struct {
-}
+type BalanceEnricher struct{}
 
 func NewBalanceEnricher() *BalanceEnricher {
 	return &BalanceEnricher{}

op-dispute-mon/mon/extract/bond_enricher.go

@@ -12,13 +12,15 @@ import (
 	"golang.org/x/exp/maps"
 )
 
+var _ Enricher = (*BondEnricher)(nil)
+
 var ErrIncorrectCreditCount = errors.New("incorrect credit count")
 
 type BondCaller interface {
 	GetCredits(context.Context, rpcblock.Block, ...common.Address) ([]*big.Int, error)
 }
-type BondEnricher struct {
-}
+
+type BondEnricher struct{}
 
 func NewBondEnricher() *BondEnricher {
 	return &BondEnricher{}

op-dispute-mon/mon/extract/head_enricher.go

@@ -10,6 +10,8 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
+var _ Enricher = (*L1HeadBlockNumEnricher)(nil)
+
 type BlockFetcher interface {
 	HeaderByHash(ctx context.Context, block common.Hash) (*types.Header, error)
 }