Archive dead-end strategies; add FINDINGS.md write-up

Moved the 8 tested-and-failed strategy tools into archive/ (copytrade, backtest,
edge_research, lookback, table_77, lp_screener, lp_paper, xarb) with an
archive/README explaining each. Root now holds the keepers: insider.py (made
self-sufficient — dropped the copytrade load_json dependency) and smart_money.py
(data foundation). New FINDINGS.md is the honest scorecard: six systematic
public-data edges all efficient/illusory, the win-rate survivorship-bias
finding, and the one real signal (z-score improbability + funding clustering).

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

insider.py

@@ -358,8 +358,8 @@ def main():
 
 def sm_load_key():
     try:
-        from copytrade import load_json
-        return load_json("config.json", {}).get("alchemy_key", "")
+        with open("config.json") as f:
+            return json.load(f).get("alchemy_key", "")
     except Exception:
         return ""