Backward HER: on trade close, injects synthetic with peak PnL if peak > 1.5× actual. Forward HER: evaluates closed trades after 50 steps, injects if holding would have been better. ISV bootstrap: threshold=1.5, priority_boost=3.0, lookahead=50. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>