Fields

Typed field handles, wrapping Java's io.github.libtmux.query.Fields records so every operator returns this facade's Expr rather than a raw Java FilterExpr . An extension cannot reshape these methods' return type on the Java records directly — same-named would silently lose to the Java member, exactly the trap -Werror exists to catch — so each kind gets its own small Scala class instead, one line per operator, forwarding to the Java one underneath.