Add crypto signals pipeline + Polymarket arb scanner

- Signal parser for Telegram JSON exports
- Price fetcher using Binance US API
- Backtester with fee-aware simulation
- Polymarket 15-min arb scanner with orderbook checking
- Systemd timer every 2 min for arb alerts
- Paper trade tracking
- Investigation: polymarket-15min-arb.md

data/investigations/polymarket-15min-arb.md

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+# Polymarket 15-Min Crypto Arbitrage
+
+**Source:** https://x.com/noisyb0y1/status/2020942208858456206
+**Date investigated:** 2026-02-09
+**Verdict:** Legitimate edge, inflated claims
+
+## Strategy
+- Buy BOTH sides (Up + Down) on 15-minute BTC/ETH/SOL/XRP markets
+- When combined cost < $1.00, guaranteed profit regardless of outcome
+- Edge exists because these markets are low liquidity / inefficient pricing
+
+## Reference Wallet
+- `0xE594336603F4fB5d3ba4125a67021ab3B4347052`
+- Real PnL on 2026-02-09: ~$9K on $82K deployed (11% daily)
+- Combined costs ranged from $0.70 (great arb) to $1.10 (not arb)
+- Best arbs: ETH markets at $0.70-0.73 combined cost
+
+## Why It Works
+- 15-min markets have thin books — prices diverge from fair value
+- Binary outcome means Up + Down must sum to $1.00 at resolution
+- If you buy both for < $1.00 total, guaranteed profit
+
+## Challenges
+- Needs significant capital ($50K+) to make meaningful returns
+- Fill quality degrades at scale — slippage kills the edge
+- Competition from other bots narrows the window
+- Not all markets have arb — some combined costs > $1.00
+
+## Revisit When
+- [ ] We have capital to deploy
+- [ ] Built a bot to scan for combined < $1.00 opportunities in real-time
+- [ ] Polymarket adds more 15-min markets (more opportunities)
+
+## Related
+- Tweet author promoting "Clawdbots" — bot product shill
+- "$99K in a day" / "$340K total" claims are inflated (real: $9K profit)