feat: evaluate the showcase generous-order guard in WebAssembly#97
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Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>
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Demonstrates a polyglot guard: the order machine's "generous order" decision, evaluated in WebAssembly, proven to behave identically to the existing CEL version.
examples/fooddeliverygains a functional-options guard seam —NewModel(WithGenerousGuard(...))lets a consumer swap the engine that produces the namedgenerousOrderguard while leaving the machine untouched; the default still compiles the CEL predicate exactly as before. The showcase compiles a tinywasip1guest implementing the samesubtotal + tip >= 6000predicate (built at test time, no binary committed) and drives both the CEL-guarded and WASM-guarded models through the authorization decision across orders chosen to isolate that branch — a generous order both admit and a frugal order both block — confirming the two engines agree.