test(event-script): one throwing call per lambda in the rangeLookup tests (IDE findings)

[acn-ericlaw]

What

• SimpleRangeLookupTest: a failure(...) helper and oneBand(...) builder so each assertThrows lambda makes one call; RangeLookupVectorsTest: the arguments are converted before the lambda. Test code only.

Why

• Nine IDE findings on the tests merged in feat(event-script): f:rangeLookup - a decision table of bands (min..max, the upper bound excluded; numeric or text), for eligibility rules, tiers and time windows #552: a lambda with several possibly-throwing calls can pass for the wrong reason.

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