Last per-caller migration before fold-eFinal (#50). Adds the 10 _v
variants of OLD log.ww's surface (new_v / lprintln_v / println_v /
lprintfln_v / printfln_v / lfatal_v / fatal_v / lfatalf_v / fatalf_v /
setlogger_v) alongside a vlogger vtable + vstdlogger over io.vstream.
Default sink is a module-static stderrsink_ctx_g with vt FIRST field for
the intrusive vstream cast and fd=2 — only scalars/ptrs beyond vt per
ken's mandate, no nested aggregates that would bite #18, no f32 per
#165b. Zero-init at link time per #129 A.2/A.3 SSoT; ensureinit_v wires
vt.reader / vt.writer / fd lazily on first dispatch (mirror of OLD
ensureinit at log.ww:122 + lib/temp's rnginit pattern).
OLD lib/log/log.ww UNCHANGED. fold-eFinal (#50) atomically retires the
OLD logger / stdlogger / globals + the pre-vtable stderrsink and drops
the `_v` suffix wholesale to match Hare's bare names.
Two `export` bumps on lib/fmt/vstream.ww (vfprint, vfprintf) so log's
stdprintln_v / stdprintfln_v dispatch through the existing vstream-side
formatters; additive exposure, eFinal collapses fprint over the unified
surface.
Bootstrap-embed check: log is NOT in any selfhost/cmd/*/main.combined.ww
(grep `package log\|import log` returns empty pre-impl). The fmt
vstream.ww changes are also non-embedded. 990-997 byte-id gates stay
green by virtue of log being test-only and the touched fmt symbols not
being embedded.
Probe wcc/779_log_vstream_run pins the additive surface across 4 rows
(println_v_default_stderr / printfln_v_default_stderr /
lprintln_v_custom_sink / branched_lprintln_v) cstage-only per #209
(wwstage formattable match-arm bail; bites OLD log.println identically).
Byte-id graduates when #209 lands.
Cite refs: ref/hare/log/{logger,funcs,global,silent}.ha; drew acks on
module-static stderrsink_ctx + intrusive vt + 10-fn _v parity; ken
mandates on bootstrap byte-id mechanical + simple-ctx + #129 static-init.
Sibling tasks parked (filed, NOT fixed): eFinal #50; #206 (2 cast sites
at ensureinit_v); #173 (stderrwrite_v constructs nomem + widens to
io.error); #209 (cstage-only).
Hojun-Cho
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