Kani

docs: correct testing documentation and commands; clean legacy references #37

Job	Run time
Proof unit tests (vault-strategy)	15s
Proof unit tests (token-swap)	15s
Proof unit tests (token-fundraiser)	15s
Proof unit tests (lending)	14s
Proof unit tests (betting-market)	17s
Proof unit tests (escrow)	16s
Proof unit tests (order-book)	13s
Kani proofs (${{ matrix.program }})	-10s
	1m 35s

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