codegen: implement HirIsInstance for instanceof builtin - #107
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Closes #101.
expr()inccodegen.cpphad nocase HirKind::IsInstance:soinstanceof()always fell through todefault: return "0". The constructor now tags eachluz_dict_new()instance with a__class__field, and the new arm walks the compile-time parent chain inclasses_to emit astrcmp-based check that respects inheritance.