Add edge-research tooling and document the full research log

Adds edge_research.py (scan ~2000 wallets for reliable/copyable weekly edge),
lookback.py (long-window half-split out-of-sample read), and table_77.py
(aggregate a wallet set to CSV). README now leads with a research log
capturing the key findings: win-rate survivorship bias, win-rate != EV,
flat-size copying is -EV, the reliable edge is rare and skews to young
accounts, and ROI is inversely related to bet size. Generated data files are
gitignored.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -7,3 +7,8 @@ config.json
 copytrade_state.json
 *.log
 *.tmp
+
+# generated research data (regenerable via edge_research.py / table_77.py)
+edge_metrics.jsonl
+edge_profitable.json
+copyable_77.csv