Issue: Missing built-in type adapters for java.time classes breaks serialization on upcoming JDK releases

Issue: Missing built-in type adapters for java.time classes breaks serialization on upcoming JDK releases: a task in LegoFlow-SWE (Harbor dataset). This is inconsistent with how java.util.Date and GregorianCalendar are handled (serialized as a formatted string). More critically, JDK 26…

The task

This is inconsistent with how `java.util.Date` and `GregorianCalendar` are handled (serialized as a formatted string). More critically, [JDK 26](https://openjdk.org/jeps/0) is making several `java.time` fields `transient`, causing reflective access to fail entirely. Serialization (and deserialization) of these types…

Part of Lego-X/LegoFlow-SWE.