fix(compilation): resolve type system and interface errors

- Add GetPoolsByToken method to cache interface and implementation
- Fix interface pointer types (use interface not *interface)
- Fix SwapEvent.TokenIn/TokenOut usage to use GetInputToken/GetOutputToken methods
- Fix ethereum.CallMsg import and usage
- Fix parser factory and validator initialization in main.go
- Remove unused variables and imports

WIP: Still fixing main.go config struct field mismatches

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

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

pkg/sequencer/reader.go

@@ -2,7 +2,6 @@ package sequencer
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"log/slog"
 	"math/big"
@@ -66,9 +65,9 @@ type Reader struct {
 	logger *slog.Logger
 
 	// Components
-	parsers    *parsers.Factory
-	validator  *validation.Validator
-	poolCache  *cache.PoolCache
+	parsers    parsers.Factory
+	validator  validation.Validator
+	poolCache  cache.PoolCache
 	detector   *arbitrage.Detector
 	executor   *execution.Executor
 
@@ -104,9 +103,9 @@ type Reader struct {
 // NewReader creates a new sequencer reader
 func NewReader(
 	config *ReaderConfig,
-	parsers *parsers.Factory,
-	validator *validation.Validator,
-	poolCache *cache.PoolCache,
+	parsers parsers.Factory,
+	validator validation.Validator,
+	poolCache cache.PoolCache,
 	detector *arbitrage.Detector,
 	executor *execution.Executor,
 	logger *slog.Logger,
@@ -333,8 +332,8 @@ func (r *Reader) processTxHash(ctx context.Context, txHash string) error {
 
 	parseStart := time.Now()
 
-	// Parse transaction events
-	events, err := r.parsers.ParseTransaction(tx)
+	// Parse transaction events (no receipt for pending transactions)
+	events, err := r.parsers.ParseTransaction(procCtx, tx, nil)
 	if err != nil {
 		r.parseErrors++
 		return fmt.Errorf("parse failed: %w", err)
@@ -347,7 +346,7 @@ func (r *Reader) processTxHash(ctx context.Context, txHash string) error {
 	r.avgParseLatency = time.Since(parseStart)
 
 	// Validate events
-	validEvents := r.validator.FilterValid(events)
+	validEvents := r.validator.FilterValid(procCtx, events)
 	if len(validEvents) == 0 {
 		r.validationErrors++
 		return nil
@@ -358,7 +357,7 @@ func (r *Reader) processTxHash(ctx context.Context, txHash string) error {
 	// Detect arbitrage opportunities for each swap
 	for _, event := range validEvents {
 		// Get input token from the swap
-		inputToken := event.GetInputToken()
+		inputToken, _ := event.GetInputToken()
 
 		// Detect opportunities starting with this token
 		opportunities, err := r.detector.DetectOpportunities(procCtx, inputToken)