The final 2 astrndup callers in w6a (main.ww fname capture and the
dupstr wrapper in parse.ww) now use the uniform γ-1 shape:
let view: str;
view.ptr = src;
view.len = n: i32;
out = strings.dup(view);
With both call sites converted, wcc.astrndup is dead and removed
from selfhost/cmd/wcc/mem.ww. amalloc + arena bootstrap stay
(other callers; #7 Phase B/C territory).
The two `// astrndup until #11 (w6a types shadow) is fixed.`
WHY-pointers are obsolete (#11 landed in 6696e95) and dropped per
CLAUDE.md rule 8.
dupstr in parse.ww keeps its (*arena, *u8, u64) signature; the
vestigial *arena param is tracked by task #10.
Verified 132/132 incl. 991_w6a_ww + 995_self_rebuild byte-identity.
Hojun-Cho
3dae4d9e9a