Hojun-Cho
461a448d5f
Loop-shaped spine walker for value-struct chains (o.i.a) and slice/str pseudo-fields (s.buf.len), read+write, both stages. SB-fallback at the catch-all preserved for unresolved module-qualified idents. Follow-ups filed: tasks #7-#10 (wwstage >6-arg frame over-alloc, chained array-elem field BX loss, & through chained DOT, signed sub-word field loads zero-extend).