refactor(logging): standardize to go-ethereum/log package

Removed slog dependency and standardized all logging to use go-ethereum/log
for consistency with Ethereum ecosystem tooling.

## Changes Made

### pkg/sequencer/reader.go
- Removed import: log/slog
- Changed logger type: *slog.Logger → log.Logger
- Updated NewReader parameter: log.Logger instead of *slog.Logger
- Changed logger creation: logger.With() → logger.New()
- Removed loggerAdapter function (no longer needed)

## Benefits
- Consistent with go-ethereum ecosystem
- Single logging framework (no slog/log mixing)
- Simpler dependency tree
- Same logging API (Info, Warn, Error, Debug)

## Testing
- ✅ Compilation verified: go build ./pkg/sequencer/...
- ✅ All logging calls work with go-ethereum/log interface

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pkg/sequencer/reader.go

@@ -3,7 +3,6 @@ package sequencer
 import (
 	"context"
 	"fmt"
-	"log/slog"
 	"math/big"
 	"sync"
 	"time"
@@ -63,7 +62,7 @@ func DefaultReaderConfig() *ReaderConfig {
 // Reader reads pending transactions from the Arbitrum sequencer
 type Reader struct {
 	config *ReaderConfig
-	logger *slog.Logger
+	logger log.Logger
 
 	// Components
 	parsers    parsers.Factory
@@ -102,7 +101,7 @@ func NewReader(
 	poolCache cache.PoolCache,
 	detector *arbitrage.Detector,
 	executor *execution.Executor,
-	logger *slog.Logger,
+	logger log.Logger,
 ) (*Reader, error) {
 	if config == nil {
 		config = DefaultReaderConfig()
@@ -117,13 +116,13 @@ func NewReader(
 	// Create swap filter with pool cache
 	swapFilter := NewSwapFilter(&SwapFilterConfig{
 		SwapChannelSize: config.BufferSize,
-		Logger:          loggerAdapter(logger),
+		Logger:          logger,
 		PoolCacheFile:   "data/discovered_pools.json",
 	})
 
 	return &Reader{
 		config:     config,
-		logger:     logger.With("component", "sequencer_reader"),
+		logger:     logger.New("component", "sequencer_reader"),
 		parsers:    parsers,
 		validator:  validator,
 		poolCache:  poolCache,
@@ -136,13 +135,6 @@ func NewReader(
 	}, nil
 }
 
-// loggerAdapter converts slog.Logger to log.Logger interface
-func loggerAdapter(l *slog.Logger) log.Logger {
-	// For now, create a simple wrapper
-	// TODO: Implement proper adapter if needed
-	return log.Root()
-}
-
 // Start starts the sequencer reader
 func (r *Reader) Start(ctx context.Context) error {
 	r.logger.Info("starting sequencer reader",
@@ -320,7 +312,7 @@ func (r *Reader) readMessages(ctx context.Context, conn *websocket.Conn) error {
 func (r *Reader) worker(ctx context.Context, id int) {
 	defer r.wg.Done()
 
-	logger := r.logger.With("worker", id)
+	logger := r.logger.New("worker", id)
 
 	for {
 		select {