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

projects/feed-hunter/data/kch123-tracking/stats.json

@@ -1,5 +1,5 @@
 {
-  "last_check": "2026-02-09T16:58:59.975254+00:00",
+  "last_check": "2026-02-09T20:27:59.790122+00:00",
   "total_tracked": 3100,
   "new_this_check": 0
 }