Vincent - Trading Engine for agents

# Vincent Trading Engine - Strategy-Driven Automated Trading

Use this skill to create and manage automated trading strategies for Polymarket prediction markets and HyperLiquid perpetuals/spot. The Trading Engine combines driver-based monitoring (web search, Twitter, newswire, price feeds) with a signal pipeline and LLM-powered decision-making to automatically trade based on your thesis. It also includes standalone stop-loss, take-profit, and trailing stop rules that work without the LLM.

All commands use the `@vincentai/cli` package.

## How It Works

**The Trading Engine is a unified system with two modes:**

1. **LLM-Powered Strategies** — Create a versioned strategy with a structured thesis, weighted drivers (web search keywords, Twitter accounts, newswire topics, price triggers), and an escalation policy. When drivers detect new information, signals are scored and batched. When the escalation threshold is met, an LLM (Claude via OpenRouter) evaluates the signals against your thesis and decides whether to trade, update the thesis, set protective orders, or alert you.
2. **Standalone Trade Rules** — Set stop-loss, take-profit, and trailing stop rules on positions. These execute automatically when price conditions are met — no LLM involved.

**Architecture:**

- Integrated into the Vincent backend (no separate service to run)
- Strategy endpoints under `/api/skills/polymarket/strategies/...`
- Trade rule endpoints under `/api/skills/polymarket/rules/...`
- HyperLiquid rules use `venue: "hyperliquid"` and route through the HL adapter
- Uses the same API key as the Polymarket or HyperLiquid skill (depending on venue)
- All trades go through Vincent's policy-enforced pipeline
- LLM costs are metered and deducted from the user's credit balance
- Every LLM invocation is recorded with full audit trail (tokens, cost, actions, duration)

## Security Model

- **LLM cannot bypass policies** — all trades go through the venue's policy-enforced skill (`polymarketSkill.placeBe...