Hojun-Cho
f4176b8749
wwstage cgmatch hardcoded `spillsz = 24` + unconditional CX write
where cstage emits `slot_size = (su->kind == TY_TAGGED) ? su->size
: 16` with `if (slot_size > 16)` gating. For 1-word-payload variants
like `(*u8 | oserror)` the slot is 16B; wwstage over-allocated and
over-wrote past the receiver's read window.
Factor cgmatch's non-ident scrutinee-type resolution + spill sizing
into matchscrutt + matchspillsz in cgenutil.ww. cgmatch gates CX
write on `spillsz > 16`; R8 gate `> 24` already correct. scanlocals
N_MATCH branch uses the same helpers — scan+emit lockstep.
Test 716: 4 rows × {cstage runtime, wwstage runtime, asm-byte-id}.
Aliased (*u8 | oserror) ok/err arms, raw (*u8 | i64) for hypothesis
breadth, (str | i64) 24B regression guard.