Add trading bot: technical analysis + Alpaca broker integration

[christianjolevski]

Summary

• Technical analysis tools: RSI, MACD, Bollinger Bands, EMA/SMA, ATR, Stochastic, VWAP — computed via technicalindicators library on OHLCV data from the existing financial API
• Alpaca broker integration: Paper/live mode trading with account info, position tracking, order placement (market/limit/stop/stop_limit), and order management
• Trading assistant meta-tool: LLM-routed meta-tool (follows financial_search pattern) that dispatches natural language queries to appropriate sub-tools
• Safety guardrails: Paper mode default, confirmation gate before order execution, position-size limits (warns >5%, refuses >20% of equity), trading policy in system prompt, "not a financial advisor" disclaimer
• Three strategy skills: trading-signals (combined TA + news + fundamentals), momentum-trading (RSI + MACD crossover), mean-reversion (Bollinger Bands)
• Conditional registration: Trading tools only appear when ALPACA_API_KEY + ALPACA_SECRET_KEY are set, following the existing Exa/Tavily pattern

Test plan

• bun install resolves technicalindicators dependency
• bun run typecheck — no new type errors introduced
• bun test — existing tests pass (9/9)
• Set Alpaca paper keys → ask "analyze AAPL for trading" → verify TA output with indicator signals
• Ask "buy 1 share of AAPL" → verify order preview shown with confirmation prompt
• Confirm → verify paper order placed and position appears
• Verify trading tools do NOT appear when ALPACA_API_KEY is unset
• Verify skills discovered: ask "should I buy NVDA?" → trading-signals skill invoked

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