feat: create v2-prep branch with comprehensive planning

Restructured project for V2 refactor:

**Structure Changes:**
- Moved all V1 code to orig/ folder (preserved with git mv)
- Created docs/planning/ directory
- Added orig/README_V1.md explaining V1 preservation

**Planning Documents:**
- 00_V2_MASTER_PLAN.md: Complete architecture overview
  - Executive summary of critical V1 issues
  - High-level component architecture diagrams
  - 5-phase implementation roadmap
  - Success metrics and risk mitigation

- 07_TASK_BREAKDOWN.md: Atomic task breakdown
  - 99+ hours of detailed tasks
  - Every task < 2 hours (atomic)
  - Clear dependencies and success criteria
  - Organized by implementation phase

**V2 Key Improvements:**
- Per-exchange parsers (factory pattern)
- Multi-layer strict validation
- Multi-index pool cache
- Background validation pipeline
- Comprehensive observability

**Critical Issues Addressed:**
- Zero address tokens (strict validation + cache enrichment)
- Parsing accuracy (protocol-specific parsers)
- No audit trail (background validation channel)
- Inefficient lookups (multi-index cache)
- Stats disconnection (event-driven metrics)

Next Steps:
1. Review planning documents
2. Begin Phase 1: Foundation (P1-001 through P1-010)
3. Implement parsers in Phase 2
4. Build cache system in Phase 3
5. Add validation pipeline in Phase 4
6. Migrate and test in Phase 5

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

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

orig/pkg/arbitrum/market/logging.go

@@ -0,0 +1,74 @@
+package market
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+// initializeLogging sets up JSONL logging files
+func (md *MarketDiscovery) initializeLogging() error {
+	// Create logs directory if it doesn't exist
+	if err := os.MkdirAll("logs", 0755); err != nil {
+		return fmt.Errorf("failed to create logs directory: %w", err)
+	}
+
+	// Open market scan log file
+	marketScanFile, err := os.OpenFile(md.config.Logging.Files["market_scans"], os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to open market scan log file: %w", err)
+	}
+	md.marketScanLogger = marketScanFile
+
+	// Open arbitrage log file
+	arbFile, err := os.OpenFile(md.config.Logging.Files["arbitrage"], os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to open arbitrage log file: %w", err)
+	}
+	md.arbLogger = arbFile
+
+	return nil
+}
+
+// Logging methods
+func (md *MarketDiscovery) logMarketScan(result *MarketScanResult) error {
+	data, err := json.Marshal(result)
+	if err != nil {
+		return err
+	}
+
+	_, err = md.marketScanLogger.Write(append(data, '\n'))
+	if err != nil {
+		return err
+	}
+
+	return md.marketScanLogger.Sync()
+}
+
+func (md *MarketDiscovery) logArbitrageOpportunity(opp *ArbitrageOpportunityDetailed) error {
+	data, err := json.Marshal(opp)
+	if err != nil {
+		return err
+	}
+
+	_, err = md.arbLogger.Write(append(data, '\n'))
+	if err != nil {
+		return err
+	}
+
+	return md.arbLogger.Sync()
+}
+
+func (md *MarketDiscovery) logPoolDiscovery(result *PoolDiscoveryResult) error {
+	data, err := json.Marshal(result)
+	if err != nil {
+		return err
+	}
+
+	_, err = md.marketScanLogger.Write(append(data, '\n'))
+	if err != nil {
+		return err
+	}
+
+	return md.marketScanLogger.Sync()
+}