## Problem
A workflow **Filter** step on a `DATE`/`DATE_TIME` field using
`IS_RELATIVE` crashes with a `RangeError` when the referenced step
output is empty or invalid. The empty value is coerced into an `Invalid
Date` (`new Date("undefined")`),
whose `.getTime()` is `NaN`, and
`Temporal.Instant.fromEpochMilliseconds(NaN)` throws, failing the
affected workflow runs.
This is a latent regression from the Date → Temporal migration (#16544):
the previous `date-fns` implementation silently returned `false` on an
invalid date, but Temporal is strict and throws. The guard was never
carried over.
## Fix
Validate the coerced date once at the boundary in `evaluateDateFilter` —
the single place arbitrary/empty step output is turned into a `Date`. An
unparseable date now resolves to "does not match" for every comparison
operand (`IS`, `IS_IN_PAST`, `IS_IN_FUTURE`, `IS_TODAY`, `IS_BEFORE`,
`IS_AFTER`, `IS_RELATIVE`), restoring the pre-migration contract.
`IS_EMPTY` / `IS_NOT_EMPTY` are intentionally excluded so emptiness is
still evaluated on the raw operand.
## Tests
Added a parameterized regression test covering every date comparison
operand with empty and missing step output, asserting no throw and a
`false` result.
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Abdul Rahman
59d708e324
