initial import: etf strategy project

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+# Factor Pipeline (Draft)
+
+1) Load universe + prices + fundamentals
+2) Compute raw factor values
+3) Clean:
+   - missing handling
+   - winsorize (per-date cross section)
+   - z-score (per-date cross section)
+4) Neutralize (optional):
+   - industry
+   - size
+5) Evaluate:
+   - IC / Rank IC
+   - decay
+   - turnover
+6) Backtest:
+   - long-short / top-k
+   - transaction costs