Kani

Replace reserve-and-cap with haircut risk model in perpetual futures #12

Job	Run time
Proof unit tests (escrow)	14s
Proof unit tests (lending)	15s
Proof unit tests (token-fundraiser)	15s
Proof unit tests (betting-market)	16s
Proof unit tests (order-book)	16s
Proof unit tests (token-swap)	20s
Proof unit tests (vault-strategy)	14s
Kani proofs (${{ matrix.program }})	-10s
	1m 40s

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