Rebrand to Winning Wallet Finder; commit validation scripts; dev-friendly docs

- Add copyback.py (in-sample copy backtest), oos.py (out-of-sample test),
  huntwide.py (wide insider sweep) — completes the detect→hunt→validate→watch
  pipeline.
- Rewrite README around Winning Wallet Finder: the z-score idea explained, how
  the pieces fit, quickstart, data sources, live-watcher setup, honest verdict.
- Extend FINDINGS with the insider-detection results and the in-sample vs
  out-of-sample copy verdict (+545% in-sample collapsed to one-wallet variance
  out-of-sample).
- Refresh config.example.json to the current schema (discord/alchemy/watch).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

config.example.json

@@ -1,24 +1,9 @@
 {
-  "mode": "paper",
-  "poll_seconds": 12,
-  "discord_webhook": "",
-  "watchlist": [],
-  "bankroll_usd": 1000.0,
-  "bankroll_pct": 0.02,
-  "price_guard_pct": 0.05,
-  "risk": {
-    "max_trade_usd": 50.0,
-    "max_position_usd": 40.0,
-    "daily_spend_cap_usd": 250.0,
-    "max_total_exposure_usd": 500.0,
-    "max_open_positions": 20,
-    "min_price": 0.05,
-    "max_price": 0.95,
-    "min_order_usd": 5.0
-  },
-  "live": {
-    "private_key": "",
-    "funder_address": "",
-    "signature_type": 1
-  }
-}
+  "discord_webhook": "https://discord.com/api/webhooks/XXXX/YYYY",
+  "alchemy_key": "your-alchemy-polygon-key",
+  "alchemy_signing_key": "whsec_from_alchemy_webhook_dashboard",
+  "watch": [
+    {"wallet": "0x0b0f92507bbc340762d38eca43eba1e11ee37af1", "name": "Famecesgoal"},
+    {"wallet": "0xe8c4d68aff65b38cac46987b9b65e01eb47d395d", "name": "JAMJAMJAM4"}
+  ]
+}