ERR: use the catch match-body form in examples/235

The preceding parser fix (parenthesized match-arm value vs payload capture)
fully enables `catch e == { case .X: (tuple) }` — both scalar and tuple arm
values. Tuple literals in statement/binding position already worked, so the
match-body form runs end-to-end.

Add a `classify` to examples/235 exercising multi-value catch match-body with
per-tag value-tuple arms; exit 164 -> 170. Regenerate the snapshot.

(Corrects an earlier note that wrongly claimed a separate "issue 0059" blocked
the tuple match-body form — no such issue exists; the capture-parse bug was the
whole problem.)

Gates: zig build, zig build test, 273/273 examples.

tests/expected/235-multi-value-failable.exit

@@ -1 +1 @@
-164
+170

tests/expected/235-multi-value-failable.txt

@@ -1 +1 @@
-multi-value result: 164
+multi-value result: 170