fix(hsm): correct ArbitrageExecuted profit measurement#1480
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execute_arbitrageread the receiver's "initial" balance after the EVMflash-loan call, which already settled the profit — so
ArbitrageExecuted.profitwas always0. Snapshot moved to before the call.Funds unaffected; accounting/observability only. Fixes #1461.
Adds a regression test that fails on unpatched code and passes with the fix.