All mutable AMM instructions now require a `deadline: u64` field (Unix
timestamp in milliseconds). Enforcement uses the LEZ-native timestamp
validity window set on ProgramOutput; the runtime rejects the
transaction if the sequencer submission timestamp is at or past the
deadline.
BREAKING CHANGE: AddLiquidity, RemoveLiquidity, SwapExactInput,
SwapExactOutput, and NewDefinition instruction variants now require a
`deadline` field.
Closes#8
Move IDL files to artifacts/ and add a convention-based CI check that
discovers all programs via */methods/guest/src/bin/*.rs and fails if
any program is missing its IDL or has one that is out of date.
