Timestamp accessors previously compiled only on schema fields, so a saved
shortcut like created_ts.getMonth() == now.getMonth() && created_ts.getDate()
== now.getDate() ("on this day") failed with unknown identifier "now" and the
only workaround froze literal month/day values into the filter.
Accessors on `now` now fold to literal date parts of the frozen per-compile
clock (UTC, CEL bases: 0-based month/day-of-week), so such filters re-resolve
on every query. Comparisons are also normalized for the renderer: a folded
literal on the left swaps operands with the operator mirrored, and
literal-vs-literal comparisons fold to a constant condition.
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