Hojun-Cho
fd7dee985e
Phase 0 last β-shape site. Two concerns in one commit because the refactor surfaced the rename: - selfhost/cmd/wcc/cgen.ww cgout buffer (cgoutbuf/cap/len + arena + cgout_grow + CGOUT_INIT_CAP) → memio.state + io.stream behind a one-shot lazy-init guard. cgout_enable drops its *arena param; memio.reset in cgout_flush keeps the buffer sticky across fns so the arena's amortisation survives — re-init per fn would abandon the buffer and re-grow from 0 via the 8→…→65536 ladder for every function (no io.close path → no os.free). - lib/memio/memio.ww private fn grow → dynamicgrow. Symmetric with dynamicwrite / dynamicclose; required because cstage bundles all imported modules into a flat TU and resolves private fns by unqualified name, so the new `import memio;` in wcc's bundle collided with selfhost/cmd/wcc/mem.ww's arena `grow`. Module-aware private-fn scoping in cstage is task #9. @test fn dynamicgrow in memiotest.ww (same package as memio.ww) renamed to dynamicgrowcases to free the name; new suffix mirrors the file's existing fixedwritecases / borrowedreadcases convention. Lazy-init guard cgoutinit. memio.dynamic runs once on first cgout_enable; subsequent enables just set cgoutmode. Mirrors lib/log/log.ww:124 ensureinit. Without it, ~14 mmap syscalls per fn and ~100 MiB+ cumulative leak on a typical bootstrap. io.write bare discard in emitbytes mirrors lib/log/log.ww:169 — memio.dynamicwrite never returns io.closed (memio.ww:166). Verified 132/132 incl. 995_self_rebuild byte-identity.