refactor: riorganizzazione script — Strategy ABC, folder strategies/waste/analysis

- src/strategies/base.py: Strategy ABC con Signal, BacktestResult, YearlyStats
- src/strategies/indicators.py: keltner_ratio, detect_squeezes, ema, atr, rv, corr
- scripts/strategies/: SQ01-SQ04 (squeeze puro/filtri), ML01 (squeeze+GBM)
- scripts/waste/: W01-W22 script scartati + REF originali
- scripts/analysis/: compare, best_yearly, final_report, paper_status
- CLAUDE.md aggiornato con nuova struttura e tabella strategie

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/strategies/__init__.py

@@ -0,0 +1,11 @@
+"""Strategie di trading — classe base e indicatori condivisi."""
+from src.strategies.base import Strategy, Signal, BacktestResult, YearlyStats
+from src.strategies.indicators import (
+    keltner_ratio, detect_squeezes, ema, atr, rv_annualized, rolling_correlation,
+)
+
+__all__ = [
+    "Strategy", "Signal", "BacktestResult", "YearlyStats",
+    "keltner_ratio", "detect_squeezes", "ema", "atr",
+    "rv_annualized", "rolling_correlation",
+]