Hojun-Cho
0715ec9662
Port cstage cmd/wcc/check.c:870-894 to exprtype. indexresult yields the resolved element tnode for slice/array, u8 for str, T for *[N]T (decay) and *T (generic), and []T for *[]T (no decay, mirrors the Hare-faithful rule at check.c:883-885). The arm stamps e.type_ via tinfofornode same shape as the A.6.1.3 BIN/UN pattern. Phase 1 A.6 step 4 of 6 — slot the indexing result type into the mandatory post-checker invariant. Cgenutil still derives index stride from AST shape (indexbaseesz, elemsizeofc, indexvaluetnode); A.6.3 will collapse those onto the now-stamped N_INDEX type_. Verified 132/132 incl. 995_self_rebuild byte-identity.