gpu-clear — guest-driven WebGPU canvas clear

A compiled .kotoba guest (demo_gpu_clear.kotoba, (gpu-clear -16776961), packed RGBA8 0xFF0000FF = opaque red) calls a single synchronous host-import (gpu_clear, module "kotoba") that clears this canvas via a real WebGPU render pass. Device/adapter setup happens once, host-side, async, before the guest ever runs — the gpu_clear call itself is genuinely synchronous, no JSPI, no Atomics.wait bridge. See src-cljs/kotoba/gpu_clear_host.cljs and ADR-2607078000 (Track B Phase 0).

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