feat: add red-team discovered IL crystallization attack (31.9 ETH optimal)

Single-cycle attack extracts 21.3 ETH (2.13%) from 1000 ETH LM:
  buy 31.9 ETH → recenter → sell all KRK

Key finding: thin pre-recenter positions allow massive price impact,
recenter rebuilds deep positions at manipulated price, sell through
deep positions recovers most ETH. IL crystallized during recenter.

This is the optimal single-buy amount — 31.95+ hits max tick,
<31 ETH extracts proportionally less.

onchain/script/backtesting/attacks/il-crystallization-optimal.jsonl

@@ -0,0 +1,3 @@
+{"op":"buy","amount":"31900000000000000000"}
+{"op":"recenter"}
+{"op":"sell","amount":"all","token":"KRK"}