Hojun-Cho
63142770de
A [N]tagged-union array-literal element fell through the is_agg multi-word-copy path (STRUCT/ARRAY/TUPLE/str/slice only) to the scalar 1-word store: the raw value landed in word 0 (the tag slot) with no tag written and no payload boxed, so a later match found no variant. Both stages under-copied identically, so the copy-depth bug was byte-id-blind — a stride-only fix would still store 1 word and pass the gate green on both-wrong. Route each tagged element through cg_widen_tagged_store / the N_LET "BP" tagged-store wrapper — the same choke-point let-init, vararg gather and struct-field stores already use — so boxing, tag-remap and zero-pad-to- slot come for free. esz now comes from the stamped slot size (rule-13); the wwstage narrow override only covered widths 1/2/4, leaving a 16/24B tagged element on the wrong 8-byte sentinel stride. rule-7 loud-stops the unwired `[N]tagged=[x...]` repeat-fill (the widen call consumes the node and trashes AX). test/wcc/685: table-driven runtime readback (106/42/13) + a build-fail row for the repeat-fill loud-stop, both stages.