Previously, position weights were recalculated every day in _generate_signals,
causing weights to change even when holdings didn't change (only ranking order
shifted). This was incorrect - weights should be locked at rebalance and remain
stable until the next rebalance.
Changes:
- _generate_signals now computes _pending_weights (for signal generation only)
- run() maintains active_weights, updated only on is_rebalance or first day
- _calculate_daily_return uses the locked active_weights
- daily_records stores active_weights in position_weights field
Result: 391 → 318 rebalances, 25.63% → 26.38% CAGR
aszerW
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