Add flash crash severe simulation

25% BTC crash, same structure as moderate but harder.
10 agents, 60s ticks, rebalance every 5 min, finite pool liquidity.
Includes shared infrastructure (test_helpers, evm_state_helpers, transaction).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jribbink

cadence/tests/evm_state_helpers.cdc

@@ -27,9 +27,7 @@ access(all) fun setVaultSharePrice(
 
 /* --- Uniswap V3 Pool State Manipulation --- */
 
-/// Set Uniswap V3 pool to a specific price via EVM.store
-/// Creates pool if it doesn't exist, then manipulates state
-/// Price is specified as UFix128 for high precision (24 decimal places)
+/// Set Uniswap V3 pool to a specific price with infinite liquidity (zero slippage).
 access(all) fun setPoolToPrice(
     factoryAddress: String,
     tokenAAddress: String,
@@ -45,7 +43,37 @@ access(all) fun setPoolToPrice(
             code: Test.readFile("transactions/set_uniswap_v3_pool_price.cdc"),
             authorizers: [signer.address],
             signers: [signer],
-            arguments: [factoryAddress, tokenAAddress, tokenBAddress, fee, priceTokenBPerTokenA, tokenABalanceSlot, tokenBBalanceSlot]
+            arguments: [factoryAddress, tokenAAddress, tokenBAddress, fee, priceTokenBPerTokenA, tokenABalanceSlot, tokenBBalanceSlot, 0.0, 0 as Int256, 0.0, 1.0]
+        )
+    )
+    Test.expect(seedResult, Test.beSucceeded())
+}
+
+/// Set Uniswap V3 pool to a specific price with finite TVL and concentrated liquidity.
+/// tvl:            total pool TVL in USD (e.g. 500_000.0)
+/// tickRange:      ±ticks from current price (e.g. 100 = ±1% for tick_spacing=10)
+/// tvlFraction:    fraction of TVL placed as liquidity (e.g. 0.95 = 95%)
+/// tokenBPriceUSD: USD price of tokenB (1.0 for stablecoins)
+access(all) fun setPoolToPriceWithTVL(
+    factoryAddress: String,
+    tokenAAddress: String,
+    tokenBAddress: String,
+    fee: UInt64,
+    priceTokenBPerTokenA: UFix128,
+    tokenABalanceSlot: UInt256,
+    tokenBBalanceSlot: UInt256,
+    signer: Test.TestAccount,
+    tvl: UFix64,
+    tickRange: Int,
+    tvlFraction: UFix64,
+    tokenBPriceUSD: UFix64
+) {
+    let seedResult = Test.executeTransaction(
+        Test.Transaction(
+            code: Test.readFile("transactions/set_uniswap_v3_pool_price.cdc"),
+            authorizers: [signer.address],
+            signers: [signer],
+            arguments: [factoryAddress, tokenAAddress, tokenBAddress, fee, priceTokenBPerTokenA, tokenABalanceSlot, tokenBBalanceSlot, tvl, Int256(tickRange), tvlFraction, tokenBPriceUSD]
         )
     )
     Test.expect(seedResult, Test.beSucceeded())