chore(deps): bump arc-vue toolchain to task baseline (Node 24, pnpm 11.11.0)

feat(layout): topological row assignment from task dependencies

ci: cache cargo builds, prebuilt wasm-pack, bump action versions

fix(bench): make L2_canvas crossover gate relative, not absolute time

ci: cache cargo builds, prebuilt wasm-pack, bump action versions

feat(bench): canvas↔SVG L2 crossover micro-bench + dispatch workflow

feat(canvas): wasm CommandBuffer export + JS replay + arc-vue opt-in

feat(backend): add CanvasBackend and CommandBuffer (Phase 2 axis B)

feat: svg virtualization

ci(bench): land bench-3layer workflow_dispatch on master

fix: progress line shap

feat: display list phase0

chore(arc-vue): migrate to Vite 8 + Rolldown + Storybook 10.4.6

docs: low end first design

fix(ci): emit preview-stats.json for Chromatic TurboSnap

chore(bench): render pipeline 3layer

fix: inazuma line diagonal

feat: svg hardening