feat: Add market making strategy with configurable spread and order cycling

[keitaj]

Summary

• New market_making strategy that places symmetric buy/sell limit orders around the mid price
• Orders are periodically refreshed and filled positions can be auto-closed
• Works in any market condition (no ranging/trending filter)
• All parameters configurable via CLI args and environment variables

New Strategy: market_making

Parameter	CLI Flag	Default	Description
Spread	--spread-bps	5 (0.05%)	One-sided spread from mid price in basis points
Order size	--order-size-usd	50	Size per order in USD
Max orders	--max-open-orders	4	Max concurrent open orders
Refresh interval	--refresh-interval	30s	Cancel and replace stale orders after this duration
Auto-close	--no-close-immediately	enabled	Disable to hold filled positions

Example Usage

# Basic market making on HIP-3 DEXes
python3 bot.py --strategy market_making --dex hyna --no-hl

# Custom spread and size
python3 bot.py --strategy market_making --dex xyz --no-hl \
  --spread-bps 10 --order-size-usd 100 --refresh-interval 60

# Hold positions instead of auto-closing
python3 bot.py --strategy market_making --no-close-immediately

How It Works

1. For each coin, place a buy limit at mid - spread and sell limit at mid + spread (post-only)
2. When an order fills, close the position on the next cycle (if close_immediately is enabled)
3. Cancel and replace orders older than refresh_interval_seconds
4. Respects RISK_LEVEL env var for dynamic position sizing (green=100%, yellow=50%, red/black=pause)

Changes

• strategies/market_making_strategy.py: New 235-line strategy with order tracking, stale order management, and spread calculation
• strategies/__init__.py: Export MarketMakingStrategy
• bot.py: Add to strategy_map, default_configs, argparse choices, and CLI arg parsing

Test plan

• Verify strategy places buy+sell limit orders around mid price
• Verify stale orders are cancelled after refresh interval
• Verify filled positions are closed immediately when enabled
• Verify --no-close-immediately holds positions
• Verify RISK_LEVEL=yellow reduces order size to 50%
• Verify RISK_LEVEL=red stops placing new orders
• Verify strategy works with HIP-3 coins (e.g. hyna:BTC, xyz:GOLD)

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