feat(testing): add Anvil fork local testing infrastructure

Complete local testing setup with Anvil fork of Arbitrum mainnet:

Infrastructure:
- Docker Compose orchestration (Anvil, MEV Bot, Prometheus, Grafana)
- Anvil fork configuration with 1-second blocks
- Multi-stage Dockerfile for optimized builds
- Health checks and auto-restart policies

Configuration:
- Comprehensive .env.example with all parameters
- Prometheus metrics collection setup
- Grafana datasource provisioning
- .gitignore to prevent committing secrets

Testing Scripts:
- setup-local-fork.sh: Initialize fork and fund test wallet
- create-test-swap.sh: Generate test swaps for bot detection
- Both scripts include validation and helpful output

Integration Components:
- pkg/sequencer/reader.go: WebSocket reader for pending transactions
  - Worker pool pattern (10 workers)
  - <50ms processing target
  - Front-running capability
  - Auto-reconnection with exponential backoff

- pkg/pools/discovery.go: Pool discovery service
  - UniswapV2-style pools (SushiSwap, Camelot)
  - UniswapV3 pools (multiple fee tiers)
  - Factory contract queries
  - Liquidity filtering

Documentation:
- TESTING.md: Complete testing guide
  - Quick start instructions
  - Testing scenarios
  - Monitoring and debugging
  - Performance benchmarks
  - Troubleshooting guide

This enables safe local testing without deploying to public testnet,
using real Arbitrum mainnet state forked locally with Anvil.

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

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

scripts/create-test-swap.sh

@@ -0,0 +1,105 @@
+#!/bin/bash
+set -e
+
+# MEV Bot V2 - Create Test Swap Script
+# This script creates a test swap on the Anvil fork for the bot to detect
+
+# Colors for output
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+RED='\033[0;31m'
+NC='\033[0m' # No Color
+
+echo "🔄 Creating test swap on Anvil fork..."
+
+# Load environment variables
+if [ ! -f .env ]; then
+    echo -e "${RED}❌ Error: .env file not found${NC}"
+    exit 1
+fi
+source .env
+
+# Token addresses on Arbitrum
+WETH="0x82aF49447D8a07e3bd95BD0d56f35241523fBab1"
+USDC="0xFF970a61A04b1cA14834A43f5dE4533eBDDB5CC8"
+
+# SushiSwap Router on Arbitrum
+SUSHISWAP_ROUTER="0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506"
+
+# Amount to swap (0.1 ETH)
+AMOUNT="100000000000000000"
+
+echo -e "${YELLOW}Token In: WETH ($WETH)${NC}"
+echo -e "${YELLOW}Token Out: USDC ($USDC)${NC}"
+echo -e "${YELLOW}Amount: 0.1 ETH${NC}"
+
+# Step 1: Wrap ETH to WETH
+echo ""
+echo "📦 Step 1: Wrapping ETH to WETH..."
+docker-compose exec -T anvil cast send $WETH \
+    "deposit()" \
+    --value 0.1ether \
+    --private-key $PRIVATE_KEY \
+    --rpc-url http://localhost:8545
+
+WETH_BALANCE=$(docker-compose exec -T anvil cast call $WETH \
+    "balanceOf(address)(uint256)" \
+    $(docker-compose exec -T anvil cast wallet address $PRIVATE_KEY) \
+    --rpc-url http://localhost:8545)
+echo -e "${GREEN}✅ WETH Balance: $WETH_BALANCE${NC}"
+
+# Step 2: Approve router to spend WETH
+echo ""
+echo "✅ Step 2: Approving SushiSwap router..."
+docker-compose exec -T anvil cast send $WETH \
+    "approve(address,uint256)" \
+    $SUSHISWAP_ROUTER \
+    "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" \
+    --private-key $PRIVATE_KEY \
+    --rpc-url http://localhost:8545
+
+echo -e "${GREEN}✅ Approval confirmed${NC}"
+
+# Step 3: Execute swap
+echo ""
+echo "🔄 Step 3: Executing swap on SushiSwap..."
+echo -e "${YELLOW}This swap should be detected by the MEV bot!${NC}"
+
+# Build swap calldata
+# swapExactTokensForTokens(uint256 amountIn, uint256 amountOutMin, address[] path, address to, uint256 deadline)
+DEADLINE=$(($(date +%s) + 3600))
+TO=$(docker-compose exec -T anvil cast wallet address $PRIVATE_KEY)
+
+docker-compose exec -T anvil cast send $SUSHISWAP_ROUTER \
+    "swapExactTokensForTokens(uint256,uint256,address[],address,uint256)" \
+    $AMOUNT \
+    "0" \
+    "[$WETH,$USDC]" \
+    $TO \
+    $DEADLINE \
+    --private-key $PRIVATE_KEY \
+    --rpc-url http://localhost:8545
+
+echo ""
+echo -e "${GREEN}✅ Test swap executed!${NC}"
+
+# Check balances
+echo ""
+echo "📊 Final balances:"
+WETH_BALANCE=$(docker-compose exec -T anvil cast call $WETH \
+    "balanceOf(address)(uint256)" \
+    $TO \
+    --rpc-url http://localhost:8545)
+echo -e "  WETH: $WETH_BALANCE"
+
+USDC_BALANCE=$(docker-compose exec -T anvil cast call $USDC \
+    "balanceOf(address)(uint256)" \
+    $TO \
+    --rpc-url http://localhost:8545)
+echo -e "  USDC: $USDC_BALANCE"
+
+echo ""
+echo -e "${GREEN}✨ Test swap complete!${NC}"
+echo ""
+echo "Check the MEV bot logs to see if it detected the opportunity:"
+echo "  docker-compose logs -f mev-bot"