Training kernel now has same order as backtest:
decode → trailing_stop → hold_enforcement → execute_trade → mark_to_market
Previously hold ran AFTER execute_trade and undid it by resetting
position/cash from ps[]. Now hold modifies target_position BEFORE
execute_trade, so the trade sees the correct target and no undo is needed.
This eliminates the last train/eval order-of-operations mismatch.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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