v1.29.0

Added

• DatePicker: "now" sentinel for date bounds — defaultValue, minimumDate, and maximumDate now accept the literal string "now" in addition to ISO 8601 date strings. "now" resolves to the current date/time at render, so a max date that should always be "today" no longer goes stale at module-load time. Schema validation accepts a value when it is "now" or parses via Date.parse.
• SetVariableButtonActionSchema / SetVariableButtonAction — exported from the headless package and added to the ButtonActionSchema union ({ type: "setVariable", name, value, label?, valueMode?, kind? }).

Fixed

• ButtonActionSchema rejected setVariable actions — the headless union only accepted "continue" and { type: "custom" }, while the UI package and runtime already supported setVariable. Any ComposableScreen payload using a setVariable button action failed parsing with invalid_union. Headless now mirrors the UI variant, fixing the schema drift.

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