Hojun-Cho
c62e8e5560
Adds bufio_vstream + isbuffered_v alongside the pre-vtable bufio.init / bufio.isbuffered surface, mirroring fold-e2's lib/memio and fold-e3's lib/fmt parallel-API shape. The OLD bufio.ww surface stays untouched; fold-eFinal (#50) atomically flips the package shape, drops the `_v` suffix, and retires the legacy callbacks. bufio_ctx wraps an underlying *io.stream (OLD API) — bufio_vstream src parameter type stays *io.stream until io fold-2 lands `handle = (file | int)` (drew-deferred). vt is the first field for the intrusive vstream→*bufio_ctx cast, same shape as memio/fmt vstream wrappers. Sibling task filed: #210 struct-lit slice-typed field silently drops under alloc(T{slice = val})?. Parallel to #207 for slice fields; scalar/ptr fields in the same alloc-struct-lit populate correctly. Workaround: post-alloc field-assign c.slicefield = val. Documented inline; drops out on close. Other deferrals retained inline: #206 cast wrappers (3 vtable wire-up + 2 isbuffered_v comparand), #173 nomem-widen for the io.closed → io.error boundary, #207 alloc-zero-chain for vt. bufio is not embedded in any selfhost combined.ww (test-only); no Makefile regen needed (#110-blind safe). test/wcc/778_bufio_vstream_run pins the 5-row scenario set: write+flush, read+refill, isbuffered_v discriminator, OLD/NEW boundary check, and a branched-callee #105 row. cs+ww+byte-id green on all 5 rows. make test: 211 passed (was 210).