Add live trading bot (paper/testnet/live modes)

[luaroncrew]

Summary

Builds a production-ready automated trading bot on top of the existing vibetrader inference pipeline.

• bot/db.py — SQLite layer for signals, trades, and positions (3 tables). Positions persist across restarts.
• bot/live_bot.py — LiveTradingBot class wrapping the diffusion model → signal extraction pipeline with configurable risk management and three execution modes:
  • Paper (default): simulated portfolio, real market prices, no API keys needed
  • Testnet: real Binance testnet orders (BINANCE_TESTNET_API_KEY/SECRET)
  • Live: real Binance spot orders (BINANCE_API_KEY + BINANCE_API_SECRET)
• bot/status.py — CLI status command showing open positions, recent signals/trades, and aggregate P&L

Key design decisions

• Spot-only (no shorting): SELL signal closes an existing long, never opens a short — safe for Binance spot
• Risk management: --position-size, --stop-loss, --take-profit, --min-confidence all configurable
• Fixes hardcoded RSI/MACD bug in original trader.py (was RSI=50.0, MACD=0.0 always)
• Handles both pixel (green_pct/red_pct) and Mistral (reasoning) signal flavors via getattr

Usage

# Paper trade BTC/USDT + ETH/USDT every 4h
python -m bot.live_bot --checkpoint checkpoints/ --pairs BTC/USDT ETH/USDT

# One-shot cycle
python -m bot.live_bot --checkpoint checkpoints/ --pairs BTC/USDT --once

# Live trading
BINANCE_API_KEY=... BINANCE_API_SECRET=... \
  python -m bot.live_bot --checkpoint checkpoints/ --pairs BTC/USDT --live

# Check status
python -m bot.status
python -m bot.status --json

Test plan

• python3 -c "from bot.db import init_db; ..." smoke test passes ✅
• Syntax check on all 3 files passes ✅
• SQLite round-trip test (init → log → query) passes ✅
• python -m bot.status --help renders correctly ✅
• Manual paper trade cycle with real Binance OHLCV data
• Live cycle on testnet with small position

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