The type-erased value type is spelled Any (capital), per specs.md and
type_resolver.zig. Lowercase 'any' is an undefined name that resolves to
an empty-struct stub, which is why ?any appeared to silently discard the
value. ?Any round-trips correctly (present/absent/unwrap all work), so
there is no Any-TypeId canonicalization bug. Reword the 0165 cross-ref
accordingly.